Hi there,
Following our recent recurrent simulator sessions there is some discussing among the trainers how to interpreted the recent change in the FCTM regarding unreliable airspeed after takeoff.
FCTM B737NG page 8.32 states:
Takeoff If an unreliable airspeed event occurs during takeoff at or after V1, maintain takeoff thrust, set 15° pitch attitude, retract the landing gear, and maintain flap configuration. Climb at 15° pitch attitude until reaching acceleration height. At acceleration height, do the Airspeed Unreliable NNC memory items and checklist.
In my company the acceleration height, when flying a N-1 or NADP 2 departure, is 800ft AGL. However Boeing stated the following on page 3.32:
The minimum altitude for flap retraction is 400 feet. The altitude selected for acceleration and flap retraction may be specified for each airport. Safety, obstruction clearance, airplane performance or noise abatement requirements are usually the determining factors. Some operators have adopted a standard climb profile for all of their operations based on the airport which requires the greatest height for level off to clear a close-in obstacle with an engine failure. During training flights, 1,000 feet AFE is normally used as the acceleration height to initiate thrust reduction and flap retraction. For noise abatement considerations during line operations, thrust reduction typically occurs at approximately 1,500 feet AFE and acceleration typically occurs between 1,500 and 3,000 feet AFE, or as specified by individual airport noise abatement procedures.
So the question is, what is the acceleration height Boeing is referring to on page 8.32?
Curious about your thoughts!