REPAIR INTERVAL A 1 NUMBER INSTALLED
ITEM 0 NUMBER REQUIRED FOR DISPATCH
REMARKS OR EXCEPTIONS
(O) May be inoperative provided:
Autopilot with altitude hold is
operative,
RVSM operations are not required, and
34-16-1 Altitude Alerting System
Repairs are made within three flight days.
EICAS STATUS MESSAGES
None
PLACARD
As appropriate
OPERATIONS (O)
Flight Crew shall comply standard callouts regarding to Altimeter Readings.
NOTE 1: After landing following a flight that was dispatched with one EICAS computer inoperative or one fuel flow indication inoperative, the FMC may determine Flight Completion during high speed taxi. When this occurs, the IRU residual ground speed may be set at a level above the 21 knots the Maintenance Manual establishes as the threshold to require replacement of the IRU. Under these circumstances, it is not required that the IRU be replaced.
NOTE 2: IRUs are interchangeable.
NOTE 3: If the left IRU is inoperative, Windshear Guidance and Alerting System will be inoperative and EICAS status message GND PROX BITE will be displayed. See MEL 34-46-1 dispatch requirements for an inoperative Windshear Guidance and Alerting System.
EICAS STATUS MESSAGES
None
PLACARD
Associated IRS Mode Selector - INOP MAINTENANCE (M)
For an inoperative left or right IRU, select center IRU using the appropriate IRS source select switch on the main instrument panel. IRU data source isolation must be verified once each flight day using the following procedure (for airplanes both with and without HMG installed):
1. Switch one of the operating IRU’s to ALIGN.
Verify that one (not both) pilot’s EADI and EHSI lose attitude and heading information.
Switch the IRU back to NAV.
OPERATIONS (O)
When dispatching with a left or right IRU inoperative, select the C FLT DIR on the INSTR SOURCE SEL panel prior to takeoff to ensure the flight director bars are displayed. Inflight select the center CMD switch to engage the autopilot.
Airplanes LBO-LBU may lose Captain’s RDMI information when the airplane is operating on standby battery power. If the center IRU is operating normally, the captain's RDMI can be restored by switching the first officer's IRS instrument source select switch to the alternate (ALTN) position.
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