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flight crew should determine the aircraft’s actual position using ground-based
navaids, if available. The positions that are in disagreement may be seen on the
POS SHIFT page.
If the UNABLE REQUIRED NAV PERF-RNP or VERIFY POSITION messages are displayed
in the CDU scratch pad, the flight crew should perform the following
procedures as necessary to ensure navigation accuracy:
1. Ensure that the navigation radios are operating in the auto-tuning mode so
that the FMC can update its position if navaids are available. Check the
PROGRESS page to ensure that radio updating is occurring.
2. Determine the actual aircraft position using raw data from the VOR
navigation or if available, ADF radios and compare that position with the
FMC position. (Use the FIX page.)
3. If radio navaids are unavailable, compare the FMC position with the IRS
position using the POS REF page of the FMC CDU. If the two IRS
positions are in agreement and the FMC position is significantly different,
the FMC position is probably unreliable. On Dual FMC equipped aircraft
also compare the relative position of FMC-L and FMC-R for accuracy.
Note: The FMC position can be updated on the POS SHIFT page to the
most accurate source from the IRS-L, IRS-R, or a VOR/DME
position from a selected navaid.
4. Confirm actual position with ATC radar or visual reference points if
available.
5. Navigate using the most accurate information available. The possibilities
are:
· LNAV (continue to monitor FMC position using VOR/ADF raw data).
737
Flight Manual Continental
Sec. 3 Page 9
Rev. 11/15/02 #41
Caution: Navigation in the LNAV mode with an unreliable FMC
position will probably result in significant navigation
errors.
· Conventional VOR/ADF procedures.
· Radar vectors from ATC.
· Dead reckoning from last known position.
· Use of visual reference.
MCP / CDU Inputs
It is imperative that changes on the Mode Control Panel (MCP) and on the
Control Display Unit (CDU) of the Flight Management Computer (FMC) be
accomplished accurately. Flight deck workload, Autopilot status,
communications requirements, etc. can all influence which pilot should perform
certain functions at any given time. The guidelines set forth below establish the
preferred procedures. If the pilot normally expected to accomplish a given task
is distracted by other duties, or flight deck workload / convenience so dictates, it
is permissible for the other pilot to make the appropriate changes. In this event,
the pilot making the changes must verbally state the changes made. Regardless
of which pilot make the inputs, all changes to routings, reroutings and
restrictions must be confirmed by both pilots at the time they are entered in the
MCP / CDU.
Autopilot On
While the autopilot is ON, all MCP and CDU operations that affect the aircraft’s
flight path are normally done by the PF. If desired, the PF can request these
steps be done by the PM.
Autopilot Off
While the Autopilot is OFF, all MCP and CDU operations should be called for
by the PF and executed by the PM.
Sec. 3 Page 10
Rev. 11/15/02 #41 Continental
737
Flight Manual
Altitude Alerting
The Altitude Alerting system shall be used during all phases of flight to assist
the flight crew in altitude awareness, and to prevent deviation from assigned
clearances. During climb and descent, the flight crew shall set the next
clearance altitude in the Altitude Selector Window. In those situations where a
clearance is received containing multiple crossing restrictions and VNAV is not
engaged, the Altitude Selector shall be set at the next altitude restriction, and
then reset for each subsequent restriction. On FMS arrivals or published
arrivals (STARS) stored in the navigation data base, the clearance limit on the
arrival (the lowest altitude) may be set in the MCP altitude window provided
VNAV is engaged to assure compliance on the arrival.
While the autopilot is ON, the PF will set new clearance altitudes in the Altitude
Selector Window. While the autopilot is OFF, the PM will select the cleared
altitude in the Altitude Selector Window. Both pilots will verbally and visually
acknowledge the cleared altitude set in the MCP.
737
Flight Manual Continental
Sec. 3 Page 11
Rev. 11/15/02 #41
PREFLIGHT INSPECTIONS
GENERAL
Before accepting an aircraft, a thorough exterior and flight deck inspection shall
be made. The responsibility for these checks rests with the Captain. The
Captain may delegate the duty to the First Officer (or IRO).
To avoid passenger inconvenience, the cabin check is not required when crew
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