Emergency Procedures Steps and NWC

Question 1

Engine Malfunction in Flight (EMIF) Steps

Answer 1

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

Question 2

Engine High-Side Failure in Flight steps

Answer 2

1. EMIF - Perform
2. PCL (malfunctioning engine) retard to set -
a. 10% below good engine
b. Match Ng, TGT

Question 3

Indications of a High-Side Failure

Answer 3

TRQ > 10% engine
Ng is > 5% other engine
Nr is > 103%
Np is matched within 5% of each other

Question 4

Engine High-Side Failure NWC
(3 N, 1 C)

Answer 4

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

Question 5

Engine High-Side Failure on Deck steps

Answer 5

1*. PCLs - IDLE

Question 6

Indications of Engine Low Side Failure

Answer 6

1. Torque 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%
   ENG Speed Low: Np is below 96% for more than 2 seconds

Question 7

Engine Low Side Failure steps

Answer 7

1*. EMIF
2. PCL (malfunctioning engine) - Retard to set:
a. Torque 10% below good engine
b. Match Ng or match TGT

Question 8

EMIF NWC (2 W)

Answer 8

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.

Question 9

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

Answer 9

TGT limiting, load sharing, Np governing.
You control Ng and Np

Question 10

Engine Torque or TGT Spiking/Fluctuations

Answer 10

1. EMIF
If fuel contamination is suspected
2. Land ASAP

Question 11

Define Spiking

Answer 11

instantaneous, momentary excursion of an engine instrument that may/may not be accompanied by associated response in Ng, Np, or Nr.

Question 12

Indications of TGT/Torque Spiking/Fluctuations

Answer 12

Torque Split - 10% difference
Nr, Torque, Ng or other instruments fluctuating may be indicative of water-contaminated fuel

Question 13

Engine Torque or TGT Spiking/Fluctuations NWC (1 W with 3 Parts)

Answer 13

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.

Question 14

Indications of a Compressor Stall

Answer 14

Rapid increase in TGT, hangup or decrease in Ng, loss or power, changes in engine noises (muffled explosions)

Question 15

Compressor Stall steps

Answer 15

1. EMIF
2. PCL (malfunctioning engine) - IDLE

Question 16

Compressor Stall NWC (1 Caution)

Answer 16

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.

Question 17

Engine High-Speed Shaft Failure Steps

Answer 17

1. EMIF
2. PCL (malfunctioning engine) - OFF