Joined: 11 Dec 2005
|Posted: Wed Jan 19, 2011 8:05 am Post subject: A310 Operation In or Near to Heavy Rain, Hail or Sleet
|A310 OPERATION IN OR NEAR TO HEAVY RAIN, HAIL OR SLEET
FCOM>>Procedure and Techniques>Inclement Weather Operation
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Effect of Water Ingestion on High By-Pass Turbofan Engines Operation:
- Water/Air ratio ingested by the engine is directly proportional to engine power and aircraft speed.
- Ingested water/air ratio is significantly increased when operating at minimum thrust level and high airspeed (typical idle descent conditions)
- During idle descent through heavy rain, hail or sleet, massive water ingestion may result in engine surge, roll-back or flame-out.
Operation In or Near Moderate to Heavy Precipitation:
- IGNITION ON CONT RELIGHT (enhances flame-out protection and maximizes rapid relight capability).
- ENGINE ANTI ICE ON (automatically sets high idle setting, improving engine tolerance to water ingestion)
- Wing Anti Ice only when icing condition exists.
- AUTO THRUST DISCONNECT.
- Changing throttle lever position should be avoided until engines have stabilized at a selected setting. Be smooth and avoid rapid throttle lever movement. Engine may exhibit a slow throttle response or parameter fluctuation (will be normal when out of heavy precipitation area) and no crew action is required unless abnormal engine parameters/behavior is observed.
- INCREASE THRUST (conditions permitting). Although maintaining a minimum N1 is not required but engine operation above idle increases tolerance to water ingestion.
- DECREASE AIRSPEED (conditions permitting) to decrease the level of ingested water/air ratio.
- START APU (in readiness for a starter assisted relight incase of an engine flame-out).