Emergency Procedures Steps and NWC Flashcards
Engine Malfunction in Flight (EMIF) Steps
1. Control Nr
2. Contingency Power - ON
3. Single Engine Conditions - Establish
4. Engine Anti-Ice switches - As required (5C and visible moisture)
5. External Cargo/stores/fuel - Jettison/Dump, as required
6*. Identify Malfunction
Engine High-Side Failure in Flight steps
1. EMIF - Perform
2. PCL (malfunctioning engine) retard to set -
a. 10% below good engine
b. Match Ng, TGT
Indications of a High-Side Failure
TRQ > 10% engine
Ng is > 5% other engine
Nr is > 103%
Np is matched within 5% of each other
Engine High-Side Failure NWC
(3 N, 1 C)
If an Np overspeed condition is reached (120%), the overspeed system will flame out the engine and the auto-ignition will relight the engines. If Nr is NOT controlled and Np accelerates back to 120% the overspeed system will flameout the engine again and auto-ignition will continue cycling until Nr/Np is controlled. Yaw kicks may be experienced.
N: Ng does NOT pass through the EDECU and is highly reliable signal
Torque may be erratic or drop off for high side driven by EDECU failure
N: Reducing collective will reveal increasing Nr and verify high-side failure
Engine High-Side Failure on Deck steps
1*. PCLs - IDLE
Indications of Engine Low Side Failure
- Torque is 10% below good engine
- Ng is 5% or less than good engine
- Np is at or below 98%
- Nr is at or below 97%
ENG Speed Low: Np is below 96% for more than 2 seconds
Engine Low Side Failure steps
1*. EMIF
2. PCL (malfunctioning engine) - Retard to set:
a. Torque 10% below good engine
b. Match Ng or match TGT
EMIF NWC (2 W)
W: Flying with greater than 110% with one engine inoperative may result in unrecoverable Nr decay in the event of a dual engine failure
W: With engine anti-ice on up to 18% torque available is lost. With malfunctioning engine inlet anti-ice up to 49% loss.
What do you lose/have to manually control when you advance PCL to lockout then retard to set appropriate conditions in a low-side failure
TGT limiting, load sharing, Np governing.
You control Ng and Np
Engine Torque or TGT Spiking/Fluctuations
1. EMIF
If fuel contamination is suspected
2. Land ASAP
Define Spiking
instantaneous, momentary excursion of an engine instrument that may/may not be accompanied by associated response in Ng, Np, or Nr.
Indications of TGT/Torque Spiking/Fluctuations
Torque Split - 10% difference
Nr, Torque, Ng or other instruments fluctuating may be indicative of water-contaminated fuel
Engine Torque or TGT Spiking/Fluctuations NWC (1 W with 3 Parts)
W: PCL movement during engine fluctuation may precipitate failure
W: Consider APU Emergency Start prior to manipulating PCLs
W: Maintaining a low power setting when moving PCLs will minimize Nr decay rate if the malfunctioning engine fails.
Indications of a Compressor Stall
Rapid increase in TGT, hangup or decrease in Ng, loss or power, changes in engine noises (muffled explosions)
Compressor Stall steps
1. EMIF
2. PCL (malfunctioning engine) - IDLE
Compressor Stall NWC (1 Caution)
If Ng decay relight feature attempts to relight the engine, subsequent compressor stalls may occur and damage the engine. Yaw kicks may be experience each time a relight is attempted. Engine must be manually shut down.
Engine High-Speed Shaft Failure Steps
1. EMIF
2. PCL (malfunctioning engine) - OFF
