FLIGHT ANOMALIES Flashcards
Start Abort Blades
Abort start if blades not turning by
25% N1
Start Abort Blades Possible Causes
Tied down, rotor brake on, carbon lock
Engine Fire on Start or Shutdown Causes
Overload of fuel in comb chamber or
delayed ignition of fuel resulting in
flames from the tailpipe
Drive Shaft Failure between engine & trans
Lh yaw, rapid dec Nr with low rotor light
Inc N2 with inc eng noise
Tail Rotor Vortex Ring State Symptoms
Uncontrollable right hand turn
Tail Rotor Vortex Ring State Recovery
lower collective (max power to t/r)
full left pedal
forward cyclic
Retreating Blade Tip Stall Symptoms
(airspeed of retreating blade exceeding VNE) LH roll, nose pitch up, shaking
Retreating Blade Tip Stall
lower collective to reduce blade pitch then lateral cyclic to slow a/s
Stuck Pedals In flight - left nose
- anticipate rolling off throttle on landing to keep straight
raise collective, nose swing right
lower collective, nose swing left
Stuck Pedals In flight - right nose
auto rotate
Stuck Pedals In the hover
right reduce throttle & raise collective to land
left lift collective to stop rotation & use cyclic to spill the lift
Vortex Ring State Conditions (6)
Flying in your own downwash
Airspeed 0-20 mph
Rate of descent 500-1500 fpm
High power, high altitude, high gross weight
Vortex Ring State Recovery
Forward cyclic while reducing collective
Vortex Ring State Prevention
Max rate of descent 300 fpm
Lag
Decrease in engine rpm as a result of a change in pitch of the main rotor blades corrected by the pilot using the beep switch
Droop
Normal decrease/increase of the engine rpm as a result of a change in pitch of the m/r blades corrected for automatically by the governor thru the linear actuator
Track
Vertical path of the blades thru the air
If one blade path is higher than the other, creates a vertical hump
- trim tab corrects problem
blade down, trim tab movement down
blade up, trim tab movement up
Balance
Lateral wobble due to uneven blade weight - correct by placing additional weight in hollow bolt on m/r grip
Mast Bumping Causes
negative G condition, updraft,
level off too quick, dive
mast bumping is caused if you counteract the RH roll with left cyclic prior to reloading the blades.
Mast Bumping Symptoms
disc is unloaded, t/r still produces thrust, causes LH yaw and RH roll
roll further induced by t/r
Mast Bumping Recovery
CORRECTIVE INPUT MUST BE AFT CYCLIC FIRST TO RELOAD BLADES THEN ONCE THE DISC IS RELOADED, LATERAL CYCLIC TO LEVEL
Ground Resonance Cause
Vibration from skids through mast to blades
Ground Resonance Recovery – low rpm
Close throttle, lower collective
Ground Resonance Recovery – ops rpm
Take off, allow blades to realign, land
Dynamic Rollover Cause
1 skid stuck or snagged
Dynamic Rollover Recovery
Down collective
