B737-700 IRS POSITION ERROR

This is a public forum for 737 maintenance related questions, requests and experience exchange discussions for every Boeing 737.


B737-700 IRS POSITION ERROR

Postby flyday » 15 Jan 2020, 04:14

Hi,
after 11 hours flight, we had L/R IRS position error as:
FMC POS, GPS L/R POS: N24/32/6, E118/07/9
IRS L: N24/32/3, E117/59/1
IRS R: N24/30/9, E118/10/1

The pos error for L/R shown on CDU are 6.9/3.6nm.

I know there are well below the AMM 34-21-00 limit for individual system.
However, this L/R DIFF cause the FMS message: VERIFY POS IRS-IRS.

Does anyone know where to look for the limit for difference?

Cheers,
Attachments
Shift.jpg
Pos Ref.jpg
Pos Ref.jpg (30.11 KiB) Viewed 1266 times
flyday
 
Posts: 15
Joined: 20 Nov 2018, 10:30

Re: B737-700 IRS POSITION ERROR

Postby flyday » 21 Jan 2020, 08:21

Upload the screenshoot.

Any mate to give some advise?

I reckon replace R adiru can solve the problem if next flight occurs similar msg again.

But that is not the prefer solution so far...
flyday
 
Posts: 15
Joined: 20 Nov 2018, 10:30

Re: B737-700 IRS POSITION ERROR

Postby motortek » 04 Feb 2020, 09:49

just check door drains maybe door drains are leaking water this water flows into adiru
motortek
 
Posts: 98
Joined: 16 Dec 2011, 02:05

Re: B737-700 IRS POSITION ERROR

Postby flyday » 05 Feb 2020, 22:28

Update:
Fault doesn't occur in the following 11 hours flight.
Last edited by flyday on 05 Feb 2020, 22:30, edited 1 time in total.
flyday
 
Posts: 15
Joined: 20 Nov 2018, 10:30

Re: B737-700 IRS POSITION ERROR

Postby flyday » 05 Feb 2020, 22:29

motortek wrote:just check door drains maybe door drains are leaking water this water flows into adiru


Thanks Motortek!

Could you please give more details?

Water flows into adiru?
flyday
 
Posts: 15
Joined: 20 Nov 2018, 10:30

Re: B737-700 IRS POSITION ERROR

Postby motortek » 26 Feb 2020, 23:51

flyday wrote:
motortek wrote:just check door drains maybe door drains are leaking water this water flows into adiru


Thanks Motortek!

Could you please give more details?

Water flows into adiru?


you know we have door drain system.this systems are collecting water from door sill drains and send bladder assembly then water going to outside with drain fittings . Most of the b737/7/8 a/c series fwd right side sill drains are blocking or sill drains head sides are detaching . when this situtation occured water leaking to e/e comp. and dropping adiru box...
motortek
 
Posts: 98
Joined: 16 Dec 2011, 02:05

Re: B737-700 IRS POSITION ERROR

Postby flyday » 04 Mar 2020, 20:48

Thanks Motor.
not in this case anyway...
flyday
 
Posts: 15
Joined: 20 Nov 2018, 10:30


Return to - 737 technical questions & requests -

Who is online

Users browsing this forum: No registered users and 3 guests

cron