SUPPLEMENTARY
PROCEDURES
FLIGHT INSTRUMENTS
AIRPLANE
OPERATIONS
MANUAL
1-02-82
Page
2
Code
01
REVISION 28
To verify if altimeter difference is within tolerance, the flight crew
should proceed as follows:
Altitude...........................................................................STABILIZE
Maintain variation within +/- 50 ft.
Air Speed.......................................................................STABILIZE
Maintain variation within +/- 5 kt.
Wait a minimum of 15 seconds in straight and leveled flight, preferably
with Autopilot engaged, to compare the difference between altitudes
using the following table:
ALTITUDE
(ft)
MAXIMUM
DIFFERENCE
BETWEEN PILOT
AND COPILOT’S
ALTIMETERS
(ft)
MAXIMUM DIFFERENCE
BETWEEN PILOT OR
COPILOT’S ALTIMETERS AND
STANDBY ALTIMETER
(ft)
0 50 150
5000 60 200
10000 60 280
15000 70 320
20000 70 500
25000 100 600
30000 120 750
35000 150 750
37000 160 750
39000 180 800
Differences greater than the values in the table must be verified by
maintenance checks.
In flight, if a discrepancy is reported between the values shown in the
table, a double check must be performed using the previous and the
next referenced altitude level.
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