B737 IRS Alignment Messages
Thread Starter
Joined: Mar 2013
Posts: 177
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From: 36,000'
B737 IRS Alignment Messages
As per the FCOM
During line operations have only seen the IRS POS/ORIGIN DISAGREE. Any examples when VERIFY POSITION can be seen.
When the Position information is contradictory IRS POS/ORIGIN DISAGREE is displayed.
If an entered latitude/longitude position is not within 4 NM of the origin airport, the CDU scratchpad message VERIFY POSITION is displayed.
Joined: Nov 2003
Posts: 496
Likes: 12
From: UK
From U10.7 the VERIFY POSITION message was changed to specify the source that needed verifying, as in your example. So I think the old VERIFY POSITION message no longer exists as it has been enhanced.
Your second FCOM quote has probably not been updated to reflect the change.
Your second FCOM quote has probably not been updated to reflect the change.
Thread Starter
Joined: Mar 2013
Posts: 177
Likes: 0
From: 36,000'
From U10.7 the VERIFY POSITION message was changed to specify the source that needed verifying, as in your example. So I think the old VERIFY POSITION message no longer exists as it has been enhanced.
Your second FCOM quote has probably not been updated to reflect the change.
Your second FCOM quote has probably not been updated to reflect the change.
VERIFY POSITION is still being mentioned in the FCOM along with IRS POS/ORIGIN DISAGREE. This is on the B737MAX and B737NG FMCU14.0. With U10.7 VERIFY POSITION message has been enhanced as you mentioned. The enhancements include
- VERIFY POS: FMC-FMC
- VERIFY POS: FMC-GPS
- VERIFY POS: FMC-RADIO
- VERIFY POS: IRS-FMC
- VERIFY POS: IRS-IRS
- VERIFY POS: IRS-RADIO
- VERIFY POS (On GND Only)
