Engine Malfunction in Flight
2 x W
W= 110% torque
W= Engine anti ice
Engine High Side Failure in Flight
1 x C
3 x N
1.Engine Malfunction in Flight emergency procedure — Perform.
2. PCL (malfunctioning engine)—Retard to set:
a. Torque 10% below good engine, or
b. Matched Ng, or
c. Matched TGT.
C = Np overspeed
N = High collective
N = Ng is a highly reliable signal
N = Torque signal may drop off
Engine High Side Failure on Deck
Engine Low Side Failure
1 x A
Identification
A = controlling engine in LOCKOUT
ID =
1. TRQ is 10% below good engine
2. Ng is 5% or less than good engine
3. Np is at or below 98%
4. Nr is at or below 97%
Engine Torque or TGT Spiking/Fluctuations
1 x W
If an engine instrument is spiking/fluctuating and inducing secondary indications in Ng, Np, and/or Nr:
1. Engine Malfunction in Flight emergency procedure —Perform.
If fuel contamination is suspected:
2. Land as soon as possible.
W = PCL movement
Compressor Stall
1 x C
C = Ng Decay Relight feature
Engine High Speed Shaft Failure
1 x C
1 x N
C = engine will overspeed
N = Np sensor unreliable
Abort Start
1 x C
5 x Indications
To abort start:
1. PCL - OFF.
2. ENGINE IGNITION switch - OFF.
If engine oil pressure is indicated:
3. Starter - Engage.
C = failure to secure fuel flow
Indications:
1. Ng does not reach 14% within 6 seconds after starter initiation.
2. No oil pressure within 30 seconds after starter initiation (do not motor engine).
3. No light-off within 30 seconds after moving PCL to IDLE.
4. ENG Starter advisory disappears before reaching 52% Ng.
5. TGT is likely to exceed 851°C before idle speed is attained.
Engine Malfunction During Hover/Takeoff
Dual Engine Failure
Single Engine Failure in Flight
1 x Advisory about ENG OUT light
Advisory = Warning light is activated by the vertical instrument when Ng decreases below 55%. In the event of an isolated Ng signal failure, the ENG OUT light will be illuminated with the engine operating normally.
Engine Air Restart
1 x W
1 x C
1 x N
W = APU unavailable
C = crossbreed starts
N = single or dual engine starts
APU emergency start
Unusual Vibrations on Deck
1 x C
C = lead/lag tendencies
Hung Droop Stops
1 x N
N = Consider turning blade de-ice on
Low Rotor RPM Warning
1 x Advisory
Advisory = Warning light is activated by the vertical instrument when Nr is less than 96%.
Main Transmission Malfunction
2 x W
3 x N
If failure imminent:
1. Land immediately.
If secondary indications are present:
2. Land as soon as possible.
W = possible indications of imminent failure
W = operating main gearbox with no oil
N = Consider applicable steps of immediate landing/ditching
N = loss of oil = unreliable temperature indications
N = continued operations in precautionary range
Tail/Intermediate Transmission Malfunction
2 x W
If failure is imminent:
1. Land immediately.
If failure is not imminent:
2. Land as soon as possible.
W = high power settings
W = transit at altitude to enter autorotation and…
(#1/2) Input Chip Caution
1x N
N = Consider returning PCL to FLY
Loss of Tail Rotor Drive Altitude and Airspeed Sufficient to Enter Autorotation
1 x W
1 x Advisory
W = altitude hold
Advisory = attempt to verify rotation as loss of drive rather than flight control jam or boost hardover
Loss of Tail Rotor Drive Altitude and Airspeed Not Sufficient to Establish Autorotation
1 x C
C = Altitude may have to be adjusted
Loss of Tail Rotor Control
5 x W
1 x N
W = servo hardover
W = appearance of #1 tail rotor servo caution
W = after touchdown
W = right yaw, too low airspeed
W = tail rotor cables damaged
N = momentary uncommanded right yaw
Tail Rotor Quadrant Caution
1 x C
C = if helo is shutdown or hydraulic power removed
Hydraulic System Warning