|
|
T.O. GR1F16CJ1 78 For preflight, carefully inspect the following areas for volcanic dust: D ECS ram inlet ducts. D Engine inlet. D LG strut chrome surface. D Pitot tube, air data probes, and AOA probes. D Static ports. After engine start, keep ground operation time and thrust to a minimum and run airconditioning at full cold setting, if practical. Do not use antiice unless required. Taxi at a safe speed considering surface conditions, GW, slope, and thrust. As volcanic ash, especially when wet, reduces RCR, perform a rolling takeoff, if possible. Consider increasing the interval between takeoffs to allow clouds of suspended volcanic ash to clear. After landing, consider shutting down the engine and have aircraft towed to the parking area. Use RCR of 18 for dry volcanic ash and 10 for wet volcanic ash if actual RCR value is unknown. INFLIGHT OPERATIONS Flight in a volcanic ash environment is extremely hazardous. Airborne radar does not detect ash clouds which visually are easily mistaken for normal clouds. Some indications of volcanic ash cloud penetration are: D Acrid odor. D Canopy opaquing. D Engine exhaust torching. D Engine surges/malfunctions. D Erroneous airspeed indications/fluctuations. D FTIT rise. D Saint Elmo's fire. D Volcanic ash entering cockpit. Upon detecting volcanic ash cloud penetration, reduce thrust and maintain minimum thrust required to sustain flight, exit the volcanic ash environment, and land as soon as practical. Do not use antiice unless required. PW 229 Engine operation above 80 percent rpm while ingesting volcanic ash may cause buildup of melted ash on turbine hardware and possible engine stalls. If possible, keep rpm at 80 percent or less until clear of volcanic ash. |