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The GPS light illuminated indicates GPS failure.
Note: The FMC will operate using only IRS or radio inputs.
No crew action required during domestic operations. On other than domestic,
refer to navigation equipment requirements for your operating area.
* * * *
FLT MGMT, NAV
Sec. 2.11 Page 12
Rev. 11/15/02 #41
Continental
737
Flight Manual
IRS ALIGN LIGHT FLASHING
When an ALIGN light is flashing either before or after present position has been
entered:
The entered latitude or longitude does not agree with the LAST POS stored
during the last shutdown, or the alignment process is complete but present
position entry was not accepted by the IRS (*CDU message: ENTER IRS
POSITION):
Re-enter the correct position into the CDU scratch pad and again line select
the SET IRS POS line (4R). Just pressing line select key 4R without first
re-entering present position into the CDU scratch pad, will not send the
present position to the IRS. If repeated attempts to enter the correct present
position through the CDU result in a continued flashing of the ALIGN light,
attempt to enter the position directly into the IRS display unit.
If the above steps was not successful, or the aircraft was moved during the
alignment phase (*CDU message: IRS MOTION):
Re-entering present position may not cause the flashing ALIGN lights to
extinguish. Select OFF and wait for the ALIGN lights to extinguish, then
initiate a full alignment.
IF The ALIGN Light Continues To Flash:
Check the MEL; Maintenance action is required.
*CDU message may not be active on some aircraft.
* * * *
IRS DC FAIL
The IRS DC FAIL light illuminated indicates the related IRS DC power has
failed.
If all other IRS lights are extinguished, operate normally. IRS DC power is
inoperative.
Note: If both IRS DC FAIL lights are illuminated, check Battery / DC
system for possible malfunctions.
* * * *
737
Flight Manual
Continental
FLT MGMT, NAV
Sec. 2.11 Page 13
Rev. 11/15/02 #41
> IRS FAILURE (IN FLIGHT)
With one IRS operating normally:
Malfunctioning IRS Mode SEL................................................................OFF
Compass Switch (Overhead Panel).....................................................BOTH ON
OPERATING SYSTEM
Attitude Switch (Overhead Panel) ................................................BOTH ON
OPERATING SYSTEM
Crosscheck and verify heading and attitude.
* * * *
IRS FAULT
Note: Placing the MASTER DIM & TEST switch to TEST for 10 seconds may
preclude this fault when associated with first alignment of the day.
IRS Mode Selector (Affected Side) ...................................................ATT
Maintain wings level, constant airspeed flight until attitude displays
recover (approximately 30 seconds).
IF The FAULT Light Extinguishes:
Magnetic Heading ................................................................. ENTER
Use the POS INIT page or the overhead IRS display in HDG/STS.
Update heading periodically.
Do not use autopilot APPROACH mode.
* * * *
IF The FAULT Light Remains Illuminated:
Instrument Transfer Switches ...............................AS REQUIRED
Do not engage either autopilot.
* * * *
OR
FLT MGMT, NAV
Sec. 2.11 Page 14
Rev. 11/15/02 #41
Continental
737
Flight Manual
IRS MODE SELECTOR PLACED IN ATTITUDE
(ATT) MODE PRIOR TO TAKEOFF
If the IRS mode selector is inadvertently placed in ATT prior to takeoff, the IRS
loses its navigation capability and the ability to automatically produce magnetic
heading. These capabilities can only be recovered by turning the system off and
performing a normal ten-minute IRS alignment cycle with the aircraft parked.
To ensure that takeoffs are not accomplished in the ATT mode, flight crews
should be aware of the following IRS attitude mode indications:
1. When an IRS enters the attitude mode, ATT and HDG flags appear on the
using flight instruments. The IRS ALIGN light illuminates steady. After
approximately 30 seconds, the light extinguishes and the ATT flag retracts
out of view. The heading flags remain in view unless magnetic heading has
been manually entered into the IRS.
2. Since all navigation parameters are lost for the system in ATT, the IRS
display unit/data displays are blank when either present position, wind, or
track/ground speed displays are selected.
3. Prompts indicating that heading needs to be entered appear on the POS
INIT page of the FMC/CDU.
Note: If heading is entered, HDG flags retract.
4. If both IRS’s are in the attitude mode, the following indications are present:
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