737 MAX Flight Crew Operations Manual
Supplementary Procedures
Chapter SP
Flight Instruments, Displays
Section 10
MN-FLT-OH-201
SP.10.1
10 Flight Instruments, Displays
Flight Instruments, Displays
File Highlight
Altimeter Difference
Note:
If flight in RVSM airspace is planned use the RVSM table in the
limitations section.
This procedure is accomplished when there is a noticeable difference
between the altimeters. Accomplish this procedure in stabilized level flight
or on the ground.
Altimeter barometric settings ........................................................ Check
Check all altimeters set to proper barometric setting for phase of
flight.
Standby altimeter baro set control ..................................Rotate and reset
Rotate to a different setting, then reset proper barometric setting.
Altimeters .............................................................................. Crosscheck
Maximum differences between the altimeter readings:
Note:
Above 10,000 feet and 0.4 Mach, position error causes the
tolerance to diverge rapidly and direct crosscheck becomes
inconclusive. Between 10,000 feet and 29,000 feet, differences
greater than 400 feet should be suspect and verified by ground
maintenance checks. Between 29,000 feet and the maximum
operating altitude, differences greater than 500 feet should be
suspect and verified by ground maintenance checks.
Altitude
CDS/CDS
CDS/Standby
Sea Level
50 feet
60 feet
5,000 feet
50 feet
80 feet
10,000 feet
60 feet
120 feet
15,000 feet
70 feet
(see note)
20,000 feet
80 feet
(see note)
25,000 feet
100 feet
(see note)
30,000 feet
120 feet
(see note)
35,000 feet
140 feet
(see note)
40,000 feet
160 feet
(see note)
41,000 feet
170 feet
(see note)
March 1, 2021