F-7 crashed airport clearance area exposed to the plight of the engine being eroded
Author: Southern Weekend reporter intern Bin Wei Juan
stop the engine at low altitude, the pilots do not want to encounter the most special situations. No matter how many pilots down before the fault symptoms, too few for targeted training, once hit, leaving only one pilot is often the opportunity for proper operation. Yes, to escape raw day, wrong, life and death. May 6, 2010, Jinan Military Region Air Force F-7 took off from the landing engine stop, in order to avoid residential areas, two pilots putting 44 mm, the aircraft to pitch up attitude from the next stoop. Eventually, the neighborhood safe, pilot a life also, one person killed.
machine to extend the line of the first ramp into the runway at three hundred meters of the ground, because of inertia, the remnants of the south slope of the first machine, and it is consistent with the final course. Aircraft grounded almost 180 degree turn, the body folded out, a lot of debris thrown south.
cockpit section of a burst of irregular-shaped, aluminum alloy body is Xunde deep a shallow one, which is explosive traces. The body in flight and air friction, Enthusiasm, hot parts with 600 degrees of heat, once the fuel tank rupture, exposure to hot parts of gas explosion is almost inevitable.
Thus, the tail is far higher than the crash point. The biggest piece of the tail wreckage location to stay away from personnel-intensive Zhangzhuang road only 74 meters.
This is the night of May 6, the crash scene, crashed in the China Air Force F-7-based senior trainer. The crash site described a night of bitter – Air Force Colonel, according to Zhang parachute rescued about the mountain, when the time is over eight hundred liters of fuel remaining on, no one can imagine, if the crash point in Zhangzhuang Road, south of the city even more District … …
However, the brutality of this scene as the pilot ejected before the last second of the putter, and finally did not become a reality. Left, only for professionals in the analysis of the crash itself: in the event of low-altitude parking when the pilot is to make the most reasonable choice? How they spend away from the machine before the last moment? Do they understand that their final action for themselves and others what it means?
After this night, the pilot Captain von night brainstorming and then subjects can perform solo release. Subjects, including night flying sorties at night a dark cabin with flight instruments, and two night traffic pattern training. The course instructor is flying squadron leader with the purpose of Zhang Shan, is the FT-7 aircraft.
FT-7 is the main force of China Air Force advanced trainer, Guizhou Aviation Industry Corporation on the basis of the J-7II fighter from the development. Training sequence in the Chinese Air Force, the FT-7 for the F major 7, F-8 fighter pilot training in two series. Therefore, said China’s second-generation F-7 pilots the “cradle” seems in order.
20 时 51 points, brainstorming von release the brakes, the aircraft began to accelerate on the runway, and then into the sky.
brainstorming von 2007, graduated from flight school. According to China’s pilot training system, student pilot during the flight schools to learn to distinguish fighters, attack planes, transport bombers training categories, only the students may become fighter pilots on the FT-7 chance of this advanced trainer. However, it was not until the beginning of his successful completion of education, in education, driving skills to master jet base, after graduating from flight school.
aircraft from the 28-year-old von widely thought to drive off before the brainstorming von also been modified with the same batch of the new pilot action essentials. Zhang Shan sat in the rear cabin. Via a joystick, Zhang Feng Shan can clearly perceive each brainstorming control action. The joystick is a trainer before and after the linkage of the cabin.
advanced trainer training, the purpose is to master the more advanced fighting techniques. “The key is to experience the load, handling air handling special situations, and enhance feel, this is not a substitute for the simulator.” Shanghai Wu Jian military observers said. Of course, in addition to training, FT-7 is also often used in some cases caused by intermittent leave, etc. The pilot flying a long time to restore the state.
night instrument flight courses, mainly familiar with the night driving conditions. The traffic pattern at night courses, in fact, take roll after landing to take off again, this is not difficult for the pilots. First, the aircraft generally use two main landing gear wheels touched the ground when the aircraft deceleration front wheel into the ground after three roll – if it is normal landing, the aircraft will gradually slow to 70 km per hour, and then parachute release until the aircraft stopped – the pilot would have to immediately increase the throttle to accelerate the slide off.
FT-7 is fast, when the aircraft climbed to 5000 meters, Feng began brainstorming outline required to do by flying. 21:18 to complete the dark cabin instrument flight courses, the brainstorming von flew straight off to prepare landing.
first row off very smoothly, and took off after the brainstorming von side of the flight in accordance with the provisions of the five. In the climb to 200 meters, turn airplane brainstorming von second side, when almost 250 meters turn. Then, the aircraft continued to climb, 500 meters height stop rising into the third side in level flight. At this time, Zhang Shan check the next remaining oil: about 800 liters.
side of the aircraft began to decline in the fourth, the fifth side, the ups and downs of preparing for a second route.
21 时 29 points, brainstorming von driving FT-7 aircraft of the landing, then accelerating on the runway taxiing.
aircraft off the ground again, the Zhang Shan feel good engine, he passed the cabin intercom system will allow brainstorming von land speed control from 330 km/hour. When the climb to 20-30 m height, climb into the aircraft landing gear close smoothly.
tree Shen Fan commanders responsible for the new members that night landing lights, night subjects command. Starting from the landing, Shen Fan’s eyes have been on the plane until the plane took off again retract the landing gear, SHEN Shu-Fan only then attention to the next plane.
FT-7 R & D is based on F-7II, it is therefore inherited the MiG-21 family classic 57-degree swept delta wing, nose into the gas layout, so as to maintain a good speed performance. But as a trainer, changed from single-seat two-seat, canopy pilots in order to facilitate access to, to turn to the right.
21 时 29 分 33 seconds, that is, the plane climbed like ten seconds, the tower suddenly came the report of Zhang Shan: “I stop a.”
flight, to determine stop the engine is not difficult. Cabin has a tachometer, the engine once the parking, speed tables will soon mean zero. There speedometer on the plane, there is no power, the aircraft’s speed will decrease rapidly. However, the experienced pilots are often able to determine with the engine sounds pretty close.
Zhang Shan has 2790 hours of flight experience, the air parking, he has experienced has not the first time. He heard the sound, almost no bow on the dashboard look and make a report to the tower. However, he or low eyes quickly glanced altimeter for aircraft lost power, the height is the time, is life. Instrumentation, aircraft altitude of about 55 meters. 55 meters, even taking into account the inertia of climb, the aircraft will most probably ten seconds of blank time.
engine sound strange, so Shen Fan to just remove the tree line of sight and turned over, then noticed that the climbing aircraft F-7 was extremely difficult.
later, the Air Force accident investigation concluded that the main fuel regulator piston drive rod jacket badly worn teeth, loss of drive, can not supply to the engine, causing the plane FT-7 appeared in the air to stop. Like a blood supply to the brain, the heart suddenly can not. The fault in the aircraft parts are maintenance-free routine maintenance areas, if there are problems, either replace the whole, or to send plant maintenance.
However, it also exposed the FT-7 is indeed faced with the reality of the plight of the engine. FT-7 turbojet power plant using -7 series engines, the old type, inherent reliability is not high.
report of Zhang Shan Carter, SHEN Shu-Fan will immediately issued a command: “jump! Parachute!”
time is 21:29:35. Zhang Shan determine the fault from the report is completed, the sink tree paradigm orders with a time of two seconds.
Zhang Shan was discovered when stopping the engine, the aircraft altitude 54 meters elevation 12.3 degrees. The front of several hundred meters, that is, residential areas and night markets, it is estimated that thousands of people. Aircraft in flight if left unchecked, it will carry 800 liters of fuel into one, its power will not be less than a bomb.
Air Force flight test experts, Xu Yongling of the reporter, in order to control the aircraft lost power must have two prerequisites, first of all is to have a high degree, followed by sufficient kinetic energy. “It was a very low altitude aircraft, speed of not more than 400 km/h, want to choose a landing back to the airport or landing field, has been impossible.” He said.
2009 March Air Force pilots flying the J-10 Li Feng driving, forced landing due to engine air parking, the ultimate success is due to that F -10 air parking, there are 1170 meters above the ground . More importantly, “the plane is not full in the event of abnormal stop.” “Knowledge of aviation,” assistant editor of the magazine emphasizes the reporter Wang Yanan, Li Feng, the aircraft is always kept at a speed of 600 km. “If he was anxious to go back, the speed increase too quickly, could stop the engine immediately.” He said.
while driving by brainstorming von FT-7 aircraft which the state can indeed speed by gliding over a period of time, if it is during the day, but not so many villages in the ground, houses, tall poles, only farmland, as well as the possibility of a forced landing. “But the aircraft’s structure and appearance of this decision, high-speed emergency landing on the ground, is likely to roll, so the possibility of landing outside the very small, the risk is very large.” An Air Force colonel said.
choice, only ejection parachute.
Zhang Shan is very aware of this, almost unconsciously, to hear the tower “jump” command, while Zhang and began before the push stick. Push stick of the moment, Zhang Shan Feng clearly felt in front of brainstorming is also doing the same action.
by FT-7 ejection programming, pull the ejection handle, the rear pilot ejected first, followed by the pilot cockpit, interval 1.1 seconds. Because, if the first jump pilot cockpit, the aircraft center of gravity will be relatively large change in rear pilot is likely impossible to escape to; jump around cabin with the pilot is not feasible, so ejected may allow phase two in the sky hit.
case of emergency, according to Zhang, was not “pulling his hands” of the parachute requests. Steady shot his right hand, left hand pull the ring pull ejection device.
change the aircraft flight path, and Zhang Shan parachute self-help movement is almost at the same time to complete. He ejected off the moment the steering column is pushed before the 44 mm, 12.3 degrees elevation from the aircraft into a depression angle 9.8 degrees.
Zhang Feng Shan brainstorming with this choice, to avoid falling into the aircraft in front of residential areas and night markets and lead to secondary accidents, but it also makes them smaller probability of survival.
time now is 21:29:37.
Zhang Shan pull down the handle, the cockpit cover body cast the first lift to fly the canopy. Then, ejection seat rocket ignition drive, push the seat and sat Zhang mountain at high speed to leave the cockpit. As the throwing motion and ejection from the machine cover two areas are completed in an instant, Zhang Shan and throw away the canopy will not feel the impact later.
In fact, the FT-7 aircraft, the pilot ejection are still many things to do before. Pilots must recover the legs and feet, the whole body by direct seat, because the acceleration of the rocket in the ejection process, the pilots will be under 15g or so overload, if you do not adjust the sitting position can easily lead to injury. There was a lot of pilots to do the ejection, there is no good protection action resulted in spinal cord injury paralysis or even a lifetime, and some lead to permanent blindness due to brain congestion.
pilot and the seat can be ejected from the general 80-100 m, and then there will be a separate seat. At this point, the main umbrella umbrella in the boot to work, it will Zhuaikai main parachute, with the wind umbrella is fully open.
However, the impact of the pilot parachute moment can not be underestimated. Can make a huge parachute pilots from the falling speed of 60 meters per second, quickly reduced to 5-10 meters per second, with a huge umbrella tension may result in damage to the pilot body, thus requiring the pilot to make timely protective action is mainly to tighten the body, resistance to impact.
well even if the umbrella open, pilot of the danger has not disappeared. “Because the landing of the moment, there are 5-10 meters per second rate of decline, if a hard fall on the ground, the impact force is quite large, there are a lot of people a leg injury after a parachute landing.” Twice successful parachute ejection test pilot Xuyong Ling said.
the worst case, the umbrella open late or not fully open, the pilot fell to the ground with high speed, will directly result in death.
Zhang mountain parachute key to success is that this time the aircraft attitude is still in the parachute within the envelope, allowing him to launch, landing the ankle injury he just.
1.1 seconds, cockpit pilots Feng brainstorming is automatically ejected, the aircraft altitude at this time although there are 32 meters, but the plane has a certain drop rate, angle of depression has become a 16 degrees, beyond the parachute envelope.
FT-7 equipped with the “zero – zero” ejection seat, you can zero altitude, zero speed, the ejection, but the use of a certain margin range. When the aircraft began to decline in the state without power, a certain slope and angle of depression, beyond the successful launch of the objective conditions permit, can not be successful ejection.
In addition, “and the seat away from the cabin, until the guide pull the umbrella out of the main parachute, Douzhu air, the whole process time is not short, probably a few seconds.” Xu Yongling that if people have landed, the main parachute is not open, resulting in the probability of casualties is very big.
5 月 6 at night, no dependents Gufeng Si last chance wide, he did not jump success at the expense of the south of the airport in Jinan Zhangzhuang.
FT-7 off the Zhangzhuang airport, built by the Japanese in 1938, renovated in 1954, its People’s Liberation Army, has 2,200-meter-long concrete runway, then dual-use airport. In 1992, after completion of the airport away from the wall, then the airport is mainly responsible Zhangzhuang military tasks. After the reforms, the accelerated development of the city he could feel the pressure to the airport to the Zhangzhuang. Local development continue to erode the military airport of the clearance area, making the aircraft after take-off if there are problems, almost no room for maneuver. Evening of 6 May, it finally let us have lost a young captain pilots Feng brainstorming.
trainer crash in after many days, the airport road south of Zhangzhuang still bustling as usual. Along a north-south road went, the road west of a large farm, that is, training aircraft crash land. However, when there is no longer retained the remains of any aircraft, only some farmers in the agricultural labor figure.
(Li Meng, Shandong University, also contributed to this article I want to thank)
related topics: Jinan Air Force fighter crashed