Modern United States Navy carrier air operations

Flight deck of the USS Abraham Lincoln (CVN-72)

Modern United States Navy aircraft carrier air operations include the operation of fixed wing and rotary aircraft on and around an aircraft carrier for performance of combat or non-combat missions. Modern United States Navy aircraft carrier flight operations are highly evolved, based on experiences dating back to 1922 with the USS Langley.

Flight deck crew

The flight deck crews of a Carrier Air Wing wear colored jerseys to distinguish their functions.[1]

Vice Adm. Richard W. Hunt crosses the rainbow sideboys during an arrival aboard the USS Abraham Lincoln (CVN-72).
The rainbow sideboys salute as Secretary of the Navy Ray Mabus boards the Nimitz-class aircraft carrier USS John C. Stennis (CVN-74).
Colors Task
Yellow
  • Aircraft handling officers
  • Catapult and arresting gear officers
  • Plane directors – authoritative for all movement of all aircraft on the flight/hangar deck
Green
  • Catapult and arresting gear crews
  • Visual Landing Aid electricians
  • Air wing maintenance personnel
  • Air wing quality control personnel
  • Cargo-handling personnel
  • Ground support equipment (GSE) troubleshooters
  • Hook runners
  • Photographer's mates
  • Helicopter landing signal enlisted personnel (LSE)
White
  • Quality Assurance (QA)
  • Squadron plane inspectors
  • Landing signal officer (LSO)
  • Air transfer officers (ATO)
  • Liquid oxygen (LOX) crews
  • Safety observers
  • Medical personnel (white with Red Cross emblem)
Red
  • Ordnance men
  • Crash and salvage crews
  • Explosive ordnance disposal (EOD)
  • Firefighter
Blue
  • Plane handlers (Trainees)
  • Chocks and chains – entry-level flight-deck workers under the yellowshirts
  • Aircraft elevator operators
  • Tractor drivers
  • Messengers and phone talkers
Purple
  • Aviation fuel handlers
Brown
  • Air wing plane captains: squadron personnel who prepare aircraft for flight
  • Air wing line leading petty officers
White/black
  • Final checker (inspector).

Everyone associated with the flight deck has a specific job, which is indicated by the color of his deck jersey, float coat and helmet.[2] Rank is also denoted by the pattern of trousers worn by flight deck crew:

When a Distinguished Visitor (DV) arrives on the ship by air, a call to "Muster the Rainbow Sideboys" is made. Typically two of each colored jersey stand opposite each other in front of the entrance to the ship to render honors to the DV. These sailors in their colored jerseys are referred to as "Rainbow Sideboys".[3]

Air Officer

The miniboss oversees flight operations from Primary Flight Control.

Also known as the air boss, the air officer (along with his assistant, the miniboss) is responsible for all aspects of operations involving aircraft including the hangar deck, the flight deck, and airborne aircraft out to 5 nautical miles (9.3 km; 5.8 mi) from the carrier. From his perch in Primary Flight Control (PriFly, or the "tower"), he and his assistant maintain visual control of all aircraft operating in the carrier control zone (surface to and including 2,500 feet (760 m), within a circular limit defined by 5 nautical miles (9.3 km; 5.8 mi) horizontal radius from the carrier), and aircraft desiring to operate within the control zone must obtain his approval prior to entry.[4]

The normal working jersey color of an air boss is yellow, but an Air Boss may wear any color jersey, as he represents everyone working on the flight deck, hangar bay, and aviation fuels personnel.

Catapult Officer

A so-called shooter gives the signal to launch an FA-18.

Also known as shooters, catapult officers are Naval Aviators or Naval Flight Officers and are responsible for all aspects of catapult maintenance and operation. They ensure that there is sufficient wind (direction and speed) over the deck and that the steam settings for the catapults will ensure that aircraft have sufficient flying speed at the end of the stroke.[4]

Aircraft Handling Officer

Also known as the aircraft handler (or just handler), the ACHO is responsible for arrangement of aircraft about the flight and hangar decks. The handler is charged with avoiding a "locked deck," where there are too many misplaced aircraft such that no more can land prior to a rearrangement.[4] The handler works in Flight Deck Control, where scale model aircraft on a flight deck representation are used to represent actual aircraft status on the flight deck.[5]

Aircraft directors

A just-landed FA-18 gets the "release brakes/taxi forward" signal.
An aviation boatswain's mate taxies an aircraft during flight operations on the USS Harry S. Truman (CVN-75).

Aircraft directors, as their name implies, are responsible for directing all aircraft movement on the hangar and flight decks. They are enlisted Aviation Boatswain's Mates.[6] They are colloquially known as Bears and those who work in the hangar go by the term Hangar Rat. On some carriers, commissioned officers known as flight deck officers also serve as aircraft directors. During flight operations or during a flight deck "re-spot", there are typically about 12-15 yellowshirts on the flight deck, and they report directly to the "handler". Although aircraft directors are often used at airports ashore, their function is particularly crucial in the confined flight deck environment where aircraft are routinely taxied within inches of one another, often with the ship rolling and pitching beneath. Directors wear yellow and use a complex set of hand signals (lighted yellow wands at night) to direct aircraft.[7]

Landing Signal Officer

The Landing Signal Officer (LSO) is a qualified, experienced pilot who is responsible for the visual control of aircraft in the terminal phase of the approach immediately prior to landing. LSOs ensure that approaching aircraft are properly configured, and they monitor aircraft glidepath angle, altitude, and lineup. They communicate with landing pilots via voice radio and light signals.[8]

Arresting Gear Officer

The Arresting Gear Officer (AGO) is responsible for arresting gear operation, settings, and monitoring landing area deck status (the deck is either clear and ready to land aircraft or foul and not ready for landing). Arresting gear engines are set to apply varying resistance (weight setting) to the arresting cable based on the type of aircraft landing.

Cyclic operations

Ordnance is brought to the flight deck from the ship's magazines deep below decks.

Cyclic Operations refers to the launch and recovery cycle for aircraft in groups or "cycles". Launching and recovering aircraft aboard aircraft carriers is best accomplished non-concurrently, and cyclic operations are the norm for U.S. aircraft carriers. Cycles are generally about one and a half hours long, although cycles as short as an hour or as long as an hour and 45 minutes are not uncommon. The shorter the cycle, the fewer aircraft can be launched/recovered; the longer the cycle, the more critical fuel becomes for airborne aircraft.[9]

"Events" are typically made up of about 12–20 aircraft and are sequentially numbered throughout the 24-hour fly day. Prior to flight operations, the aircraft on the flight deck are arranged ("spotted") so that Event 1 aircraft can easily be taxied to the catapults once they have been started and inspected. Once the Event 1 aircraft are launched (which takes generally about 15 minutes), Event 2 aircraft are readied for launch about an hour later (based on the cycle time in use). The launching of all these aircraft makes room on the flight deck to then land aircraft. Once Event 2 aircraft are launched, Event 1 aircraft are recovered, fueled, re-armed, re-spotted and readied to be used for Event 3. Event 3 aircraft are launched, followed by the recovery of Event 2 aircraft (and so on throughout the fly day). After the last recovery of the day, all of the aircraft are generally stored up on the bow (because the landing area aft needs to be kept clear until the last aircraft lands). They are then re-spotted about the flight deck for the next morning's first launch.[9]

Pre-launch

Catapult personnel verify aircraft weight with the pilot prior to launch.

Approximately 45 minutes before launch time, flight crews conduct walk-around inspections and man their aircraft. Approximately 30 minutes prior to launch, aircraft are started, and pre-flight inspections are conducted. Approximately 15 minutes prior to launch, ready aircraft are taxied from their parked positions and spotted on or immediately behind the catapults. The ship is turned into the natural wind. As an aircraft is taxied onto the catapult, the wings are spread and a large jet blast deflector (JBD) panel rises out of the flight deck behind the engine exhaust. Prior to final catapult hookup, Final Checkers (inspectors) make final exterior checks of the aircraft, and loaded weapons are armed by Ordnancemen.

Catapult launch

"Hookup Man" ensures that aircraft launchbar (left) and holdback fitting (right) are properly seated in the catapult.

Catapult hook up is accomplished by placing the aircraft launch bar, which is attached to the front of the aircraft's nose landing gear, into the catapult shuttle (which is attached to the catapult gear under the flight deck). An additional bar, the holdback, is connected from the rear of the nose landing gear to the carrier deck. The holdback fitting keeps the aircraft from moving forward prior to catapult firing. In final preparation for launch, a series of events happens in rapid succession, indicated by hand/light signals:

Once the catapult fires, the hold-back breaks free as the shuttle moves rapidly forward, dragging the aircraft by the launch bar. The aircraft accelerates from zero (relative to the carrier deck) to approximately 150 knots (280 km/h; 170 mph) in about 2 seconds. There is typically wind (natural or ship motion generated) over the flight deck, giving the aircraft additional lift.[10]

Post launch

Simultaneous Case I launch.

Procedures used after launch are based on meteorological and environmental conditions (weather and daylight).

Departure/recovery types

There are three types of departure and recovery operations, which are referred to as case I, case II, and case III. Primary responsibility for adherence to the departure rests with the pilot; however, advisory control is given by the ship's Departure Control radar operators, including when dictated by weather conditions.

Case I
When it is anticipated that flights will not encounter instrument conditions (instrument meteorological conditions) during daytime departures/recoveries, and the ceiling and visibility around the carrier are no lower than 3,000 feet (910 m) and 5 nautical miles (9.3 km; 5.8 mi) respectively.

Immediately after becoming airborne, aircraft raise their landing gear and perform "clearing turns" to the right off the bow and to the left off the waist catapults. This ~10° check turn is to increase separation of (near) simultaneously launched aircraft from the waist/bow catapults. After the clearing turn, aircraft proceed straight ahead paralleling the ship's course at 500 feet (150 m) until 7 nautical miles (13 km; 8.1 mi). Aircraft are then cleared to climb unrestricted in visual conditions.

Case II
When it is anticipated that flights may encounter instrument conditions during a daytime departure/recovery, and the ceiling and visibility in the carrier control zone are no lower than 1,000 feet (300 m) and 5 nautical miles (9.3 km; 5.8 mi) respectively. Used for an overcast condition.

After a clearing turn, aircraft proceed straight ahead at 500 feet paralleling ship's course. At 7 nautical miles (13 km; 8.1 mi), aircraft turn to intercept a 10-nmi arc about the ship, maintaining visual conditions until established outbound on their assigned departure radial, at which time they are free to climb through the weather. The 500-foot (150 m) restriction is lifted after 7 nautical miles (13 km; 8.1 mi) if the climb can be continued in visual conditions.

Case III
When it is anticipated that flights will encounter instrument conditions during a departure/recovery because the ceiling or visibility around the carrier are lower than 1,000 feet (300 m) and 5 nautical miles (9.3 km; 5.8 mi) respectively; or for night time departures/recoveries.

A minimum launch interval of 30 seconds is used between aircraft, which climb straight ahead. At 7 nautical miles (13 km; 8.1 mi), they turn to fly the 10-nmi arc until intercepting their assigned departure radial.

"Clearing turn" is performed for Case I/II launches.

Flight operations

Aircraft are often launched from the carrier in a somewhat random order based on their deck positioning prior to launch. Therefore, aircraft working together on the same mission must rendezvous airborne. This is accomplished at a pre-determined location, usually at the in flight refueling tanker, overhead the carrier, or at an en route location. Properly equipped F/A-18E/F Super Hornets provide "organic" refueling, or U.S. Air Force (or other nations') tankers provide "non-organic" tanking. After rendezvous/tanking, aircraft proceed on mission.

All aircraft within the carrier's radar coverage (typically several hundred miles) are tracked and monitored. As aircraft enter the Carrier Control Area, a 50-nautical-mile radius (93 km; 58 mi) around the carrier, they are given more scrutiny. Once airwing aircraft have been identified, they are normally turned over to Marshal Control for further clearance to the marshal pattern.

Recovery operations

As with departures, the type of recovery is based on the meteorological conditions and are referred to as case I, case II, or case III.

Case I

NATOPS manual graphic of Day Case I overhead landing pattern.

Aircraft awaiting recovery hold in the port holding pattern, a left-hand circle tangent to the ship's course with the ship in the 3-o'clock position, and a maximum diameter of 5 nautical miles (9.3 km; 5.8 mi). Aircraft typically hold in close formations of two or more and are stacked at various altitudes based on their type/squadron. Minimum holding altitude is 2,000 feet (610 m), with a minimum of 1,000 feet (300 m) vertical separation between holding altitudes. Flights arrange themselves to establish proper separation for landing. As the launching aircraft (from the subsequent event) clear the flight deck and landing area becomes clear, the lowest aircraft in holding descend and depart the stack in final preparation for landing. Higher aircraft descend in the stack to altitudes vacated by lower holding aircraft. The final descent from the bottom of the stack is planned so as to arrive at the "Initial" which is 3 nautical miles (5.6 km; 3.5 mi) astern the ship at 800 feet (240 m), paralleling the ship's course. The aircraft are then flown over the ship and "break" into the landing pattern, ideally establishing at 50-60 second intervals on the aircraft in front of them.[11]

If there are too many (more than 6) aircraft in the landing pattern when a flight arrives at the ship, the flight leader initiates a "spin", climbing up slightly and executing a tight 360° turn within 3 nautical miles (5.6 km; 3.5 mi) of the ship.

The break is a level 180° turn made at 800 feet (240 m), descending to 600 feet (180 m) when established downwind. Landing gear/flaps are lowered, and landing checks are completed. When abeam (directly aligned with) the landing area on downwind, the aircraft is 180° from the ship's course and approximately 1.5 nautical miles (2.8 km; 1.7 mi) from the ship, a position known as "the 180" (because of the angled flight deck, there is actually closer to 190° of turn required at this point). The pilot begins his turn to final while simultaneously beginning a gentle descent. At "the 90" the aircraft is at 450 feet (140 m), about 1.2 nautical miles (2.2 km; 1.4 mi) from the ship, with 90° of turn to go. The final checkpoint for the pilot is crossing the ship's wake, at which time the aircraft should be approaching final landing heading and at approximately 350 feet (110 m). At this point, the pilot acquires the Optical Landing System (OLS), which is used for the terminal portion of the landing. During this time, the pilot's full attention is devoted to maintaining proper glideslope, lineup, and angle of attack until touchdown.[12]

A drop line runs vertically from the flight deck down to near the waterline on the stern of the ship. In this graphic, the viewer is left of centerline.

Line up on landing area centerline is critical because it is only 120 feet (37 m) in length, and aircraft are often parked within a few feet (metres) either side. This is accomplished visually during Case I using the painted "ladder lines" on the sides of the landing area and the centerline/drop line (see graphic).

Maintaining radio silence, or "zip lip", during Case I launches and recoveries is the norm, breaking radio silence only for safety-of-flight issues.

Case II

This approach is utilized when weather conditions are such that the flight may encounter instrument conditions during the descent, but visual conditions of at least 1,000 feet (300 m) ceiling and 5 nautical miles (9.3 km; 5.8 mi) visibility exist at the ship. Positive radar control is utilized until the pilot is inside 10 nautical miles (19 km; 12 mi) and reports the ship in sight.

Flight leaders follow Case III approach procedures outside 10 nautical miles (19 km; 12 mi). When within 10 nautical miles (19 km; 12 mi) with the ship in sight, flights are shifted to tower control and proceed as in Case I.

Case III

Case III approach used during Instrument Flight Rules

This approach is utilized whenever existing weather at the ship is below Case II minimums and during all night flight operations. Case III recoveries are made with single aircraft, with no formations except in an emergency situation).[13]

All aircraft are assigned holding at a marshal fix, typically about 150° from the ship's Base Recovery Course (BRC), at a unique distance and altitude. The holding pattern is a left-hand, 6-minute racetrack pattern. Each pilot adjusts his holding pattern to depart marshal precisely at the assigned time. Aircraft departing marshal will normally be separated by 1 minute. Adjustments may be directed by the ship's Carrier Air Traffic Control Center (CATCC), if required, to ensure proper separation. In order to maintain proper separation of aircraft, parameters must be precisely flown. Aircraft descend at 250 knots (460 km/h; 290 mph) and 4,000 feet per minute (1,200 m/min) until 5,000 feet (1,500 m) is reached, at which point the descent is lessened to 2,000 feet per minute (610 m/min). Aircraft transition to a landing configuration (wheels/flaps down) at 10 nautical miles (19 km; 12 mi) from the ship. If the stack is held more than 10 degrees away from the final bearing (approach course to the ship), then at 12.5 nautical miles (23.2 km; 14.4 mi), the pilot will arc at 250 knots (460 km/h; 290 mph), to and then intercept that final bearing, to proceed with the approach.

Correcting to the Final Bearing using ILS, ACLS, LRLU, or Carrier Controlled Approach.

No matter what, since the landing area is angled approximately 10° from the axis of the ship, aircraft final approach heading (Final Bearing) is approximately 10° less than the ship's heading (Base Recovery Course). Aircraft on the standard approach without an arc (called the CV-1) still have to correct from the marshal radial to the final bearing, and this is done in such case, at 20 nautical miles (37 km; 23 mi). As the ship moves through the water, the aircraft must make continual, minor corrections to the right to stay on the final bearing. If the ship makes course correction–which is often done in order to make the relative wind (natural wind plus ship's movement generated wind) go directly down the angle deck, or to avoid obstacles–lineup to center line must be corrected. The further the aircraft is from the ship, the larger the correction required.

Aircraft pass through the 6-nautical-mile (11 km; 6.9 mi) fix at 1,200 feet (370 m) altitude, 150 knots (280 km/h; 170 mph), in the landing configuration and commence slowing to final approach speed. At 3 nautical miles (5.6 km; 3.5 mi), aircraft begin a gradual (700-foot-per-minute (210 m/min) or 3-4°) descent until touchdown. In order to arrive precisely in position to complete the landing visually (at 3⁄4 nautical mile (1.4 km; 0.86 mi) behind the ship at 400 feet (120 m)), a number of instrument systems/procedures are used. Once the pilot acquires visual contact with the optical landing aids, the pilot will "call the ball". Control will then be assumed by the LSO, who issues final landing clearance with a "roger ball" call. When other systems are not available, aircraft on final approach will continue their descent using distance/altitude checkpoints (e.g., 1,200 feet (370 m) at 3 nautical miles (5.6 km; 3.5 mi), 860 feet (260 m) at 2 nautical miles (3.7 km; 2.3 mi), 460 feet (140 m) at 1 nautical mile (1.9 km; 1.2 mi), 360 feet (110 m) at the "ball" call).

Approach

The Carrier Controlled Approach is analogous to ground-controlled approach using the ship's precision approach radar. Pilots are told (via voice radio) where they are in relation to glideslope and final bearing (e.g., "above glideslope, right of centerline"). The pilot then makes a correction and awaits further information from the controller.

The Instrument Carrier Landing System (ICLS) is very similar to civilian ILS systems and is used on virtually all Case III approaches. A "bullseye" is displayed for the pilot, indicating aircraft position in relation to glideslope and final bearing. The Automatic Carrier Landing System (ACLS) is similar to the ICLS, in that it displays "needles" that indicate aircraft position in relation to glideslope and final bearing. An approach utilizing this system is said to be a "Mode II" approach. Additionally, some aircraft are capable of "coupling" their autopilots to the glideslope/azimuth signals received via data link from the ship, allowing for a "hands-off" approach. If the pilot keeps the autopilot coupled until touchdown, this is referred to as a "Mode I" approach. If the pilot maintains a couple until the visual approach point (at 3⁄4 nautical mile (1.4 km; 0.86 mi)) this is referred to as a "Mode IA" approach.

The Long Range Laser Lineup System (LLS) uses eye-safe lasers, projected aft of the ship, to give pilots a visual indication of their lineup with relation to centerline. The LLS is typically used from as much as 10 nautical miles (19 km; 12 mi) until the landing area can be seen at around 1 nautical mile (1.9 km; 1.2 mi).

Regardless of the case recovery or approach type, the final portion of the landing (3⁄4 nautical mile (1.4 km; 0.86 mi) to touchdown) is flown visually. Line-up with the landing area is achieved by lining up painted lines on the landing area centerline with a set of lights that drops from the back of the flight deck. Proper glideslope is maintained using the Fresnel lens Optical Landing System (FLOLS), Improved Fresnel Lens Optical Landing System (IFLOLS),[14] or Manually Operated Visual Landing Aid System (MOVLAS).

If an aircraft is pulled off the approach (if the landing area is not clear, for example) or is waved off by the LSO (for poor parameters or a fouled deck), or misses all the arresting wires ("bolters"), the pilot climbs straight ahead to 1,200 feet (370 m) to the "bolter/wave-off pattern" and waits for instructions from approach control.

Fresnel Lens Optical Landing System aboard USS Dwight D. Eisenhower (CVN-69). Note that this system uses the Fresnel lens design.

Landing

An F/A-18 makes an arrested landing.

The pilot aims for the middle arresting wire, which is either the second or third depending on the configuration of the carrier. Immediately upon touchdown, the pilot advances the throttles to full power so that a touch and go (known as a "Bolter") can be executed in the event that all trap wires have been missed.[15] Ideally, the tailhook catches the target wire (or cross deck pendant), which abruptly slows the aircraft from approach speed to a full stop in about two seconds. As the aircraft's forward motion stops, the throttles are reduced to idle, and the hook is raised on the aircraft director's signal.[16]

After landing, aircraft are packed on the bow to keep the landing area clear.

The aircraft director then directs the aircraft to clear the landing area in preparation for the next landing. Remaining ordnance is de-armed, wings are folded, and aircraft are taxied to parking spots and shut down. Immediately upon shutdown (or sometimes prior to that), the aircraft is re-fueled, re-armed, and inspected, minor maintenance is performed, and it is often re-spot prior to the next launch cycle.

Carrier qualifications

The purpose of carrier qualifications (CQ) is to give pilots a dedicated opportunity to develop fundamental skills associated with operating fixed wing, carrier based aircraft and demonstrate acceptable levels of proficiency required for qualification. During CQ, there are typically far fewer aircraft on the flight deck than during cyclic operations. This allows for much easier simultaneous launch and recovery of aircraft. The waist catapults (that are located in the landing area) are generally not used. Aircraft can trap and be taxied immediately to a bow catapult for launch.

Types and requirements

Carrier qualification is performed for new pilots and periodically for experienced pilots to gain/maintain carrier landing currency. Requirements (the number of landings/touch-and-goes required) are based on the experience of the pilot and the length of time since his last arrested landing.[17]

Gallery

See also

References

  1. ↑ John Pike (2000-04-06). "Carrier Design". Globalsecurity.org. Retrieved 2015-10-13.
  2. ↑ The US Navy Aircraft Carriers
  3. ↑ "A Guide to the Color-coded Jerseys on an Aircraft Carrier". United States Navy. Retrieved 16 November 2010.
  4. 1 2 3 (PDF), CV NATOPS Manual.
  5. ↑ Johnson, Robert (9 Oct 2012). "See Why Every US Aircraft Carrier Needs A Ouija Board". Business Insider. Retrieved 17 October 2013.
  6. ↑ FM 1-564 Appendix A
  7. ↑ Naval Aviation Aircraft Handling
  8. ↑ , LSO NATOPS Manual.
  9. 1 2 http://members.tripod.com/~Motomom/CVN103
  10. ↑ HowStuffWorks "How Aircraft Carriers Work"
  11. ↑ Naval Air Systems Command (1 Aug 2006). A1-F18AC-NFM-000 Naval Aviation Training and Operating Procedures Standardization (NATOPS) Manual. United States Department of the Navy. p. 350.
  12. ↑ Naval Air Systems Command (1 Aug 2006). A1-F18AC-NFM-000 Naval Aviation Training and Operating Procedures Standardization (NATOPS) Manual. United States Department of the Navy. p. 360.
  13. ↑ Naval Air Systems Command (1 Aug 2006). A1-F18AC-NFM-000 Naval Aviation Training and Operating Procedures Standardization (NATOPS) Manual. United States Department of the Navy. p. 361.
  14. ↑ The Meatball | How Things Work | Air & Space Magazine
  15. ↑ A bolter is when the aircraft's tailhook fails to catch an arresting wire, causing the aircraft to apply full power and go back around for another try at landing. retrieved July 23rd 2009
  16. ↑ HowStuffWorks "The Tailhook and Landing on an Aircraft Carrier"
  17. ↑ , LSO NATOPS Manual pg. 6-4.

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