737 MAX Flight Crew Operations Manual
Performance Inflight
Text
737-8/LEAP-1B28
FAA
CATB
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
MN-FLT-OH-201
PI.38.11
Engine Inoperative
Initial Max Continuous %N1
The Initial Max Continuous %N1 setting for use following an engine
failure is shown. The table is based on the typical all engine cruise speed
of .79 Mach to provide a target %N1 setting at the start of driftdown. Once
driftdown is established, the Max Continuous %N1 table should be used to
determine %N1 for the given conditions.
Max Continuous %N1
Power setting is based on one engine operating with one A/C pack
operating and all anti-ice bleeds off. Enter the table with pressure altitude,
TAT, and IAS or Mach to read %N1. Power settings may be interpolated
for intermediate airspeeds. %N1 bleed corrections are provided per
pressure altitude.
It is desirable to maintain engine thrust level within the limits of the Max
Cruise thrust rating. However, where thrust level in excess of Max Cruise
rating is required, such as for meeting terrain clearance, ATC altitude
assignments, or to attain maximum range capability, it is permissible to use
the thrust needed up to the Max Continuous thrust rating. The Max
Continuous thrust rating is intended primarily for emergency use at the
discretion of the pilot and is the maximum thrust that may be used
continuously.
Driftdown Speed/Level Off Altitude
The table shows optimum driftdown speed as a function of cruise weight
at start of driftdown. Also shown are the approximate weight and pressure
altitude at which the airplane will level off considering 100 ft/min residual
rate of climb.
The level off altitude is dependent on air temperature (ISA deviation).
Driftdown/LRC Cruise Range Capability
This table shows the range capability from the start of driftdown.
Driftdown is continued to level off altitude. As weight decreases due to
fuel burn, the airplane is accelerated to long range cruise speed. Cruise is
continued at level off altitude and long range cruise speed.
March 1, 2021
