737 Flight Crew Operations Manual
10.5
Boeing Proprietary. Copyright © Boeing. May be subject to export restrictions under EAR. See title page for details.
D6-27370-4Q8-SJA
10.5
21 Choose one:
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Continued on next page
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▼Airspeed Unreliable continued▼
Altitude is reliable:
■ ■ ■ ■
Altitude is unreliable:
PM398, PQ976 - PT832
Transponder
mode selector . . . . . . . . . . . . . ALT OFF
PP518, PP519
Transponder
mode selector . . . . . . . . . ALT RPTG OFF
PM411
Transponder
ALT reporting switch . . . . . . . . . . . . OFF
PM410, PQ487
Transponder
ALT RPTG switch . . . . . . . . . . . . . . . OFF
This step prevents reporting an
incorrect altitude that can cause an
incorrect RA.
June 15, 2020
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