Copyright . The Boeing Company. See title page for details.
SP.9.4 March 29, 2004
737 Flight Crew Operations Manual
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:
Altitude CDS/CDS CDS/Standby
Sea Level 50 feet 50 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)
Note: Above 10,000 feet and 0.4 Mach, position error causes the tolerance to diverge rapidly and direct crosscheck becomes inconclusive. Differences greater than 400 feet should be suspect and verified by ground maintenance checks.
Copyright . The Boeing Company. See title page for details.
March 29, 2004 SP.10.1
Supplementary Procedures -Flight Instruments, Displays 737 Flight Crew Operations Manual
If it is not possible to identify which altimeter is indicating the correct altitude:
ATC ................................................................................................Notify
QFE Operation
This procedure is accomplished when ATC altitude assignments are referenced to QFE altimeter settings.
Note: Do not use LNAV or VNAV below transition altitude/level. Altitudes in the navigation data base are not referenced to QFE. Use only raw data for navigation.
YA721 - YA809, YC411 - YD655 FMC/CDU APPROACH REFERENCE page or TAKEOFF REFERENCE page 2/2 ........................................... Select
LANDING REF line select key .................................................. Push Verify QFE selected. [This sets the landing altitude to zero.] Altimeters ............................................................................................ Set Set altimeters to QFE when below transition altitude/level.
Note: If QFE altimeter setting is beyond the range of the altimeters, QNH procedures must be used with QNH set in the altimeters. Landing altitude indicator ....................................................... Set at zero YA626, YA721 - YA803 Terrain inhibit switch ..............................................TERRAIN INHIBIT
Copyright . The Boeing Company. See title page for details.
Supplementary Procedures -Flight Instruments, Displays 737 Flight Crew Operations Manual
Setting Airspeed Bugs with an Inoperative FMC
To set reference airspeed bugs for takeoff:
Speed reference selector (outer) .....................................................V1 Default speed of 80 knots is displayed.
Speed reference selector (inner) .....................................Set V1 speed V1 bug is displayed when a speed greater than 80 knots is set. The NO VSPD flag is displayed until both V1 and VR are set.
Speed reference selector (outer) .................................................... VR Default speed of 80 knots is displayed. Speed reference selector (inner) ....................................Set VR speed VR bug is displayed when a speed greater than 80 knots is set. The NO VSPD flag is removed after both V1 and VR are set. MCP speed selector .................................................................Set V2 Airspeed cursor and V2+15 bug move to the correct speeds. Speed reference selector (outer) ................................................... WT Default weight of 32,000 kgs is displayed. Speed reference selector (inner) ................... Set takeoff gross weight Flaps up maneuver speed bug is displayed.
Note: If VREF is selected on the ground, INVALID ENTRY is displayed. To set the spare bug, if desired:
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