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Chapter 055 Level 2 Maintenance Capability

All F-15 settings and visual guidance are displayed on the head-up display.

The F-15 fighter has a multi-functional avionics system, including a head-up display (Head-, HUD), ultra-high frequency (Ultra-High Frequency, UHF) communication, tactical navigation system and instrument landing system (, ILS).

And Hughes AN/APG-70 (C/D type) or AN/APG-63 (A/B type) fire control radar, AN/ASN-108 attitude/direction reference system, AN/ALQ-119 electronic jamming Pod, AN/ARN-118 TACAN system, AN/ASN-109 inertial navigation system, AN/AWG-20 fire control system, AN/ASK-6 air data computer, CP-1075/AYK central data computer, etc.

The F-15's AN/ASN-109 inertial navigation system (INS) can provide navigation for the F-15 anywhere in the world.

It can integrate with the AN/ASN-108 attitude/direction reference system to provide the real-time position, pitch/roll, attitude, heading, acceleration and velocity of the aircraft.

Electronic warfare systems can simultaneously provide threat alerts and conduct electronic countermeasures against selected threats.

Towed decoys complement traditional radar jamming methods and are used against modern radar-guided missiles—the decoy simulates an enemy radar signature and tricks the seeker into locking onto itself instead of the aircraft.

The F-15's multi-function pulse Doppler radar can look down to search for targets, and can use the Doppler effect to prevent the target's signal from being masked by ground noise. Small high-speed targets.

The radar signal reflected by the target will be transmitted to the central computer. Under the close-range dogfight, the radar can automatically capture the target and project the target information on the head-up display.

Tactical Electronic Warfare Systems (TEWS), IFFs (IFF), and Electronic Countermeasures (ECM) devices provide warning of threat sources and countermeasures automatically.

The head-up display in the head-up display and dual-stick control system (HOTAS) will display flight-related information provided by the avionics system integration, which can be interpreted in any flight environment, providing pilots flying, chasing and hunting enemy aircraft or other targets The necessary and real-time information, without looking down at the instruments in the cockpit, greatly reduces the pilot's control burden when searching, tracking, and attacking targets, and simplifies the control procedures.

The F-15A is equipped with an AN/APG-63 all-weather multi-mode radar system.

The APG-63 radar works in the X-band, has a long detection distance, and has the ability to look down and shoot down.

The detection information is automatically sent to the central computer, and is fed back to the pilot together with the calculation results in real time (through the HUD and DUD).

The APG-63 has a variety of air-to-air working modes, which can be selected according to different search methods or selected engagement modes: different pulse repetition frequencies (PRF): long-range search, using medium/high PRF, according to the search distance selected by the pilot (18.5 to 296 km) to determine the PRF, in order to obtain better head-on and tail-track search results.

Speed ​​search, using high PRF, dedicated to targets approaching at high speed; short-range search, using medium PRF, used to provide data for Sidewinder missiles and cannons during combat, with three detection ranges of 16, 32, 64 kilometers, can Track multiple targets.

As a backup of the above three modes, APG-63 also has a non-PD mode, which uses low PRF and can only provide the ability to look up, because the non-PD mode cannot filter ground clutter.

In addition, the APG-63 has a variety of modes that provide special functions, including: beacon mode, which is used to transmit interrogation signals to the airborne aircraft's identification friend or foe (IFF) system; manual tracking mode, as a backup to automatic tracking mode.

Passive mode, used to monitor external radar radiation signals, while only sending weak pulses to minimize the possibility of self-exposure; map mapping mode.

In 1973, the APG-63 radar was put into service.

In 1979, the radar was equipped with a programmable signal processor, the first time it was used on an airborne radar.

This allows the system to be programmed in software to adapt to new tactics, usage patterns, and weapon systems without the need for large-scale hardware improvements.

Production of the APG-63 was discontinued in 1986, with approximately 1,000 produced, equipping all F-15A/B and earlier F-15C/Ds.

But APG-63 is not perfect. Its mean time between maintenance (MTBM) is less than 15 hours.

Technical support for the system's line-line replaceable units (LRUs) is increasingly difficult. One reason is that many components are difficult to source, and the adoption of new technology components often requires redesigning the system and is forced to abandon it.

On the other hand, deteriorating reliability has affected the deployment of aircraft.

If the air station does not have secondary maintenance capabilities, it cannot provide technical support for radar failures.

In addition, due to design constraints, the APG-63 does not actually have the extra processing power and storage capacity to upgrade the software to deal with the growing threat. To this end, the APG-70 radar has been replaced from the late F-15C/D model.

APG-63 (V) 1 is a major modification made for the shortcomings of APG-63, and has been significantly improved in reliability and maintainability to meet user requirements.

As part of the U.S. Air Force's radar retrofit program, the APG-63(V)1 will replace the APG-63 with the F-15C/D to ensure the U.S. Air Force's radar advantage.

The (V)1 system replaced the transmitter, receiver, data processor, low voltage power supply and signal data converter. While the system capability is enhanced, the reliability is increased by nearly 10 times, and the MTBM reaches 120 hours.

Performance data F-15 fighter basic parameters:

Crew: 1 (A/C), 2 (B/D/E).

Captain: 19.45 meters.

Wingspan: 13.05 meters.

Machine height: 5.65 meters.

Wing area: 56.5 square meters.

Overall empty weight: 12973 kg.

Maximum take-off weight: 30,845 kg.

Reference performance:

Maximum flight speed: Mach 2.5.

Practical ceiling: 19800 meters (A/B/C/D type), 15000 meters (E type).

Maximum range: 5745 kilometers (with conformal fuel tank), 4631 kilometers (without conformal fuel tank).

The C-type is 5,556 kilometers (with a suitable fuel tank and three external auxiliary fuel tanks), and the E-type can reach 5,741.2 kilometers with a suitable fuel tank and three external auxiliary fuel tanks, and 4444.8 kilometers with only the auxiliary fuel tank.

Combat radius: 1967 kilometers.

Climb rate: 254 m/s.

Wing load: 546 kg/m².

Push-to-weight ratio ~www.wuxiamtl.com~ Limit overload: +9/-3G.

Take-off roll distance: 274 meters (volley).

Landing roll distance: 1067 meters (volley, no parachute).

Endurance time: 5 hours and 15 minutes (without air refueling), 15 hours (air refueling).

powerplant:

Engine: 2 F110 afterburner turbofan engines.

Afterburner thrust: 2×129 kN.

Fuel capacity: 6103 kg (internal fuel tank), 9818 kg (3 external fuel tanks and 2 conformal fuel tanks).

Weapon system / bomb load: 7300kg-10705kg.

Missiles: AIM-7 air-to-air missile, AIM-9 air-to-air missile and AIM-120 air-to-air missile.

Aerial bombs: ordinary bombs, free fall nuclear bombs, GBU-28 bunker penetrating bombs.

Cannon: An M61A1 Vulcan cannon.

......

"They're here!"

Jin Twinkle suddenly spoke out, and before Zhou Wenwen could react, Jin Twinkle suddenly shrank and gained weight. Under the acceleration of gravity, he threw himself on the ground.

......

To be continued

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Chapter 056 Preview F-15C/DMSIP