|
|
T.O. GR1F16CJ1 3129 129 GE Departures at high altitude may result in an engine stall. Prolonged negative g flight at a high engine thrust level may result in an engine bearing failure. Retard the throttle to IDLE. Do not advance the throttle until beginning the dive recovery. Upright deep stalls may be very stable with little or no pitch motions or may be very oscillatory with large pitch, roll, and yaw motions. Generally, a clean configuration results in a deep stall with a near wingslevel pitching motion. During upright deep stalls with a centerline store, particularly a 300gallon fuel tank, the aircraft tends to roll and yaw right while pitching up, and roll and yaw left while pitching down. During deep stalls with 370gallon fuel tanks, the aircraft nose motion appears triangular. This motion is characterized by a roll and yaw right while pitching up, followed by a pitch down, a hesitation, and yaw to the left. In an upright deep stall or spin, the yaw rate limiter automatically provides antispin controls and the rudder authority limiter prevents pilot yaw commands. The yaw rate limiter is effective in preventing spins with almost all CAT I loadings. However, following a yaw departure above 25,000 feet, aircraft with CAT I loadings that have all the following characteristics may spin: S Centerline store. S Inlet mounted pod(s). S Lateral asymmetry greater than 300 pounds at stations 1, 2, or 3. Upright spins following a yaw departure can be disorienting. The initial portion of the spin is characterized by highly oscillatory motions and a high yaw rate (70 to 100 degrees per second). Initially, the aircraft spins roughly around the aircraft's flight path at departure. As the spin continues, the rotation axis eventually becomes vertical. Very noticeable forward g (eyeballs out) and sideforces are present. In a spin, the yaw rate must be allowed to subside before the aircraft can be recovered. This may require 20 to 30 seconds. Pitch, roll, and yaw oscillations associated with a deep stall should not be confused with the continuous yaw rotation of a spin. When the yaw rotation subsides, the aircraft will either recover or will settle into an upright deep stall. In an inverted deep stall or spin, the yaw rate limiter automatically provides rudder against the yaw rate. Roll and rudder commands should be avoided. Pilot roll and rudder commands are inhibited when MPO is engaged. The aircraft must be rocked out of a deep stall with the MPO switch held in OVRD until recovery is complete. The MPO switch allows the pilot to use the horizontal tail surfaces to reinforce pitch oscillations until the pitch rates are sufficient for recovery. When sufficient nosedown pitch rate is generated to reduce the AOA below the deep stall AOA, the aircraft will recover. during pitch rocking. If the MPO switch is released, the horizontal tails reposition to reduce AOA and may negate any pitch oscillations. Additionally, if the MPO switch is positioned to OVRD without any stick commands, the horizontal tails streamline and prevent recovery. with nose movement; i.e., if the nose is pitching up, pull back on the stick. Maintain aft stick until the maximum pitch attitude is reached, which is indicated by the nose stopping and reversing direction, and then push full forward on the stick to generate a nosedown pitch rate. If the nosedown pitch rate is high enough to break the deep stall, the aircraft will recover. stable with essentially no pitching motion. In these cases, pull full aft stick (away from the ground) and monitor nose movement. If nose movement occurs, continue stick cycling inphase. If nose movement is not apparent after 34 seconds, then push full forward on the stick to generate a nosedown pitch rate. This nosedown pitch rate may be sufficient to reduce AOA below the deep stall AOA and recover the aircraft. If the nose does not continue down but reverses and starts up, pull back on the stick and continue to reinforce these pitch cycles. Proper pitch rocking is accomplished by allowing the nose to lead stick motion; i.e., when nose movement reverses, the stick should be reversed. When sufficient nosedown pitch rate is generated to reduce the AOA below the deep stall AOA, the aircraft will recover. and yaw motions make it more difficult to determine proper recovery inputs; however, pitch attitude is still the best indication available. This pitch attitude is determined by the nose position with respect to the horizon. If unable to determine pitch motions with outside references, the ADI may be useful. oscillations progressively increases until large enough for recovery. Rapid fore and aft cycling of the stick or cycling out of phase with the pitching motion of the aircraft will not be effective and may prevent recovery. Pitch inputs must be abrupt and maximum command. Pitch inputs that are smooth or less than |