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TMccrury
Topic Author
Posts: 159
Joined: Sun Oct 09, 2005 10:24 am

737 AD for Faulty Electronic Control of Aft Cargo Fire Suppression

Tue Aug 10, 2021 8:20 am

The FAA has issued an AD for the B737 due to a faulty aft cargo fire suppression electronic control issue. It affects 663 aircraft in the US. All MAX variants are affected as well as some -800, -900 series aircraft. Not much else in the article.

https://www.bizjournals.com/stlouis/new ... -jets.html

An article from Simple Flying on it as well.

https://simpleflying.com/boeing-737-air ... directive/
 
B757Forever
Posts: 942
Joined: Tue May 04, 2010 3:23 am

Re: 737 AD for Faulty Electronic Control of Aft Cargo Fire Suppression

Tue Aug 10, 2021 2:11 pm

The AD is actually for ATA chapter 21 which is air conditioning. The AD is to address a situation that could occur if a failed pack flow controller allowed airflow to the aft baggage bin and diluted the halon suppressant.

SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all The Boeing Company
Model 737-8, 737-9, and 737-8200 (737 MAX) airplanes; and certain Model 737-800 and 737-
900ER series airplanes. This AD was prompted by the determination that the aft cargo compartment
fire suppression capability is reduced if the airplane is dispatched or released with failed electronic
flow control of air conditioning packs, as is currently allowed by these airplane models' master
minimum equipment lists (MMELs). This AD prohibits the carriage of cargo in the aft cargo
compartment when the airplane is dispatched or released with failed electronic flow control of air
conditioning packs. The FAA is issuing this AD to address the unsafe condition on these products
 
smokeybandit
Posts: 1587
Joined: Mon Mar 17, 2014 3:24 pm

Re: 737 AD for Faulty Electronic Control of Aft Cargo Fire Suppression

Tue Aug 10, 2021 5:32 pm

But how will it be addressed, other than limiting dangerous cargo?

The AD says a projected cost, but doesn't mention what a real fix is.
 
kalvado
Posts: 3299
Joined: Wed Mar 01, 2006 4:29 am

Re: 737 AD for Faulty Electronic Control of Aft Cargo Fire Suppression

Tue Aug 10, 2021 5:45 pm

smokeybandit wrote:
But how will it be addressed, other than limiting dangerous cargo?

The AD says a projected cost, but doesn't mention what a real fix is.

This is not a failed electronic component issue, this is a correction to MEL
IF certain electronic component fails,
THEN
you can defer repairs;
you must take care of cargo bin loading in a certain way

Listed cost is for paperwork processing only

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