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Chapter 055 Level Maintenance Ability

All F-15 settings and visual guidance will be displayed on the heads-up display.

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

As well as 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 atmospheric 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 be integrated with the AN/ASN-108 attitude/direction reference system to provide the aircraft's real-time position, pitch/roll, attitude, heading, acceleration and speed and other related information.

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

The towed decoy is a supplement to traditional radar jamming methods and is used to deal with modern radar-guided missiles - the decoy can simulate enemy radar signals and induce the guidance head to lock on itself rather than the aircraft.

The F-15's multifunctional pulse Doppler radar can look down to search for targets. It uses the Doppler effect to prevent the target's signal from being obscured by ground noise, and can track targets from outside the visual range to close range and treetop height. Small high-speed target.

The radar signal reflected by the target will be transmitted to the central computer. In close combat, the radar can automatically capture the target and project the target information onto the head-up display.

Tactical Electronic Warfare System (TEWS), Identification Friend of Foe (IFF) and Electronic Counter Measure (ECM) devices provide warning of threat sources and automatically carry out countermeasures.

The head-up display and dual-stick control system (HOTAS) will display flight-related information provided by the integration of the avionics system. It can be interpreted in any flight environment and provide pilots with the ability to fly, track and hunt enemy aircraft or other targets. It provides necessary and real-time information without having to look down at the instruments in the cockpit, which greatly reduces the pilot's control burden when searching, tracking, and attacking targets, and simplifies the control procedures.

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

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

The detection information is automatically sent to the central computer and fed back to the pilot in real time (through the head-up display and lower display) together with the calculation results.

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

Speed ​​search, using high PRF, is dedicated to targets approaching at high speed; close range search, using medium PRF, is used to provide data for Sidewinder missiles and aircraft guns during combat. It has three detection ranges of 16, 32, and 64 kilometers, which can Track multiple targets.

As a backup to the above three modes, APG-63 also has a non-PD mode, which uses low PRF and can only provide upward viewing capabilities 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 Identification Friend or Foe (IFF) system of aircraft in the air; manual tracking mode, which serves as a backup to the automatic tracking mode.

Passive mode is 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 use.

In 1979, the radar was equipped with a programmable signal processor, which was its first application on an airborne radar.

This allows the system to adapt to new tactics, usage patterns, and weapons systems through software programming without the need for large-scale hardware improvements.

In 1986, APG-63 production was discontinued, with a total of approximately 1000 units produced, equipping all F-15A/B models and early F-15C/D models.

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

Technical support for the system's Line Replaceable Units (LRUs) is increasingly difficult. One reason is that it is difficult to procure many components, and the use of new technology components often requires system redesign and is forced to give up.

On the other hand, continued deterioration in reliability affects 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 limitations, the APG-63 actually does not have the extra processing power and storage capacity to upgrade the software to deal with increasing threats. To this end, the APG-15 radar has been installed starting from the late F-70C/D.

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

As part of the U.S. Air Force radar replacement plan, APG-63(V)1 will replace APG-63 and equip F-15C/D to ensure the U.S. Air Force radar advantage.

The (V)1 system replaced the transmitter, receiver, data processor, low voltage power supply and signal to data converter. While system capabilities have been enhanced, reliability has increased nearly 10 times, with MTBM reaching 120 hours.

Performance data F-15 fighter basic parameters:

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

Length: 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: 30845 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 has a range of 5556 kilometers (carrying a suitable fuel tank and three external auxiliary fuel tanks), the E type can reach a distance of 5741.2 kilometers when carrying a suitable fuel tank and three external auxiliary fuel tanks, and 4444.8 kilometers when carrying only auxiliary fuel tanks.

Combat radius: 1967 kilometers.

Climb rate: 254 meters/second.

Wing load: 546 kg/m.

Thrust to weight ratio: 0.85.

Limit overload: +9/-3G.

Takeoff roll distance: 274 meters (volley).

Landing roll distance: 1067 meters (interception, without parachute).

Endurance time: 5 hours and 15 minutes (without in-flight refueling), 15 hours (in-flight refueling).

powerplant:

Engine: 2 F110 afterburning turbofan engines.

Afterburner thrust: 2x129 kN.

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

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

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

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

Cannon: One M61A1 Vulcan cannon.

......

"They're coming!"

Jin Shining suddenly spoke out, and before Zhou Wenwen could react, Jin Shining suddenly shrank in size and gained weight, and under the acceleration of gravity, he jumped straight to the ground.

......

To be continued

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Chapter 056 Preview F-15C/DMSIP