SUPPLEMENTARY
PROCEDURES
NAVIGATION
AIRPLANE
OPERATIONS
MANUAL
1-02-80
Page
6
Code
01
REVISION 36
AOM-145/1114
It has been observed that, during normal operation when flying with
the autopilot using ADC 1 as source of information and transponder 2
is selected for transmitting altitude information to ATC or vice versa,
the altitude difference between the two ADC’s, however small it is, is
seen by ATC as discrepancy between the assigned altitude and the
actual altitude, adding to the altitude overall error. For this reason,
when the autopilot uses ADC 1 as source of information, transponder
1 should be used to report altitude because during normal operation it
is connected to ADC 1. The same logic applies when using ADC 2 as
source of information, that is, transponder 2 should be used.
CRUISE
Be sure that all required equipment are in proper operating condition.
Ensure that the aircraft is flown at the cleared flight level and that ATC
clearances are fully understood and followed. Do not depart from
cleared flight level without a positive clearance from ATC except for a
contingency or emergency situation.
While changing flight levels, do not overshoot or undershoot the
cleared flight level by more than 45 m (150 ft).
The autopilot should be operative and engaged during level cruise,
except for circumstances such as the need to re-trim the airplane or
when it must be disengaged due to turbulence.
AFTER LANDING
In case of failure or malfunction, the following information should be
recorded when appropriate:
a) Primary and standby altimeter readings;
b) Altitude selector setting;
c) Subscale setting on altimeter;
d) Flight Director used with the Autopilot to control the airplane and
any differences when the other Flight Director was coupled;
e) Use of air data computer selector for fault diagnosis procedure;
f) The transponder selected to provide altitude information to ATC
and any difference noted when an alternative transponder was
selected.
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