737 Flight Crew Operations Manual
Supplementary Procedures Chapter SP
Flight Instruments, Displays Section 10
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D6-27370-866-EGP SP.10.1
10 Flight Instruments, DisplaysFlight Instruments, DisplaysFile 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)
September 24, 2015
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