737-400/800 single CH CATII approach?
Thread Starter
Join Date: Jan 2006
Location: here, there, everywhere
Posts: 279
Likes: 0
Received 0 Likes
on
0 Posts
737-400/800 single CH CATII approach?
Hi! I am a 'Bus driver and know next to nothing on the 737, but I was asked for some help with CAT II ops. I'd like to get some info on the following:
- are single autopilot CAT II approaches allowed on the 737?
- if yes, are they practiced by any operators?
- what is the minimum a/p disengagement height in case of 1CH and how does it affect the DH for CAT II? (both for the -400 and the -800)
- can CAT II approach be performed without a/p on the 737? (heard this was an option with F/O flying the app manually and Capt taking over at DH). Is this allowed in EASA land?
- are single autopilot CAT II approaches allowed on the 737?
- if yes, are they practiced by any operators?
- what is the minimum a/p disengagement height in case of 1CH and how does it affect the DH for CAT II? (both for the -400 and the -800)
- can CAT II approach be performed without a/p on the 737? (heard this was an option with F/O flying the app manually and Capt taking over at DH). Is this allowed in EASA land?
For B737CL in our operation.
Single channel AP limited to Cat1
Minimum Altitude for AP 50' unless dual channel auto land (AFM limit)
Autopilot required for ops below Cat1
Not all B737CL have AFM approval for Cat3a operations
Don't have any info on B737NG's
Single channel AP limited to Cat1
Minimum Altitude for AP 50' unless dual channel auto land (AFM limit)
Autopilot required for ops below Cat1
Not all B737CL have AFM approval for Cat3a operations
Don't have any info on B737NG's
Join Date: Aug 2008
Location: Romania
Age: 43
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
We were alllowed to do single channel CAT 2 approach in the classics because the A/P can remain engaged till 50 ft AGL . (JAA) Acording OPS 1 you have to keep the A/P engaged till 80% of the minima => 100 RA X .8 = 80 ft where you had to disconnect and perform a manual landing if you have visual reference. Boeing introduced new limitations for CAA registered aircraft that in my opinion make no sense, but that's other story.
Regarding NG , MUH (minimum use height) of the A/P single channel is 158 ft => NO single channel CAT 2 approach allowed.
Regarding NG , MUH (minimum use height) of the A/P single channel is 158 ft => NO single channel CAT 2 approach allowed.
Per Ardua ad Astraeus
Join Date: Mar 2000
Location: UK
Posts: 18,579
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by B737-pilot
We were alllowed to do single channel CAT 2 approach in the classics because the A/P can remain engaged till 50 ft AGL
It used to be 140 ATE for Classic and 50 for NG.
Thread Starter
Join Date: Jan 2006
Location: here, there, everywhere
Posts: 279
Likes: 0
Received 0 Likes
on
0 Posts
It used to be 140 ATE for Classic and 50 for NG.
Can any of the 737-400 Jocks check their AFM and tell me the minimum disengagement height?
Join Date: Mar 2001
Location: I wouldn't know.
Posts: 4,498
Likes: 0
Received 0 Likes
on
0 Posts
In my outfit the autopilot minimum use height for single channel operation of the NG has been defined as 160ft AGL, i guess its just the rounded up 158ft or slight differences within a fleet of several different variants. CAT II single channel operation is not allowed. However single engine autoland is approved, but that is still dual channel, although only fail passive instead of fail operational.
