Ok, I'm not flying jets (yet
),
but I'm curious, what is the difference between these two procs, and
what kind of planes would which one, (when if both) ?
What would a 767 use ?
Mike
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From the Canadian Air Pilot - GEN
VNAP (Vertical Noise Abatement)
Procedure 'A'
===========
Take-off to 1500' above aerodrome elevation
- take-off power
- take-off flap
-climb at V2 + 10 to 20 kt (or as limited by body angle)
At 1500':
- reduce thrust to not less than climb power/thrust
1500' to 3000':
- climb at V2 + 10 to 20 kt
At 3000'
- accelerate smoothly to enroute climb speed with flap retraction on
schedule
Procedure 'B'
===========
Take-off to 1000' above aerodrome elevation
- take-off power/thrust
- take-off flap
-climb at V2 + 10 to 20 kt
At 1000':
- maintain a positive rate of climb, accelerate to zero flap minimum
safe manoeuvering speed (VzF) retracting flap on schedule
therafter:
reduce thrust consistent with the following:
a) for high bypass ratio engines, reduce to normal climb power/thrust
b) for low bypass ratio engines, reduce power/thrust if practicable to
below normal climb thrust but not less than that neccessary to maintain
the final take-off engine-out climb gradient: and
c) for aircraft with slow flap retraction, reduce power/ thrust at an
intermediate flap setting
thereafter
From 1000' to 3000'
- continue climb at not greater than VzF + 20 kt
At 3000'
- accelerate smoothly to enroute climb speed using normal climb
power/thrust