Testing of idle reverse thrust before takeoff. A wise precaution?
https://avherald.com/h?article=4c5b3f3d&opt=0
An A320 lands and reverse thrust fails to operate. There had been no prior warning flags in the cockpit. Maintenance staff had forgotten to remove the reverser lockout pins after servicing. The situation could have been critical if a high speed rejected takeoff occurred at the departure airfield and the crew were unaware the reversers had been locked out. System caution lights have removed the once good airmanship requirement of the momentary testing of brakes after moving from the tarmac. However, the above incident illustrates that on this occasion a fault in reverser operation did not show up to the cockpit crew until too late A short test of reverse idle at an appropriate point before takeoff would have revealed this maintenance defect.. Another cue for good airmanship? . |
A short test of reverse idle at an appropriate point before takeoff would have revealed this maintenance defect.. Another cue for good airmanship? . |
Originally Posted by A37575
(Post 10427558)
https://avherald.com/h?article=4c5b3f3d&opt=0
An A320 lands and reverse thrust fails to operate. There had been no prior warning flags in the cockpit. ..........and the crew were unaware the reversers had been locked out. ......... Another cue for good airmanship? |
A reverser not working is rarely that big a deal on landing |
A thought
The plane is certified to stop safely with the reversers locked out. Give a thought to how many tasks you want to perform over and above what's in the manuals |
Originally Posted by A37575
(Post 10427647)
But could be a seriously big deal on a high speed rejected take off if runway limited..
I’m with the previous poster. Why make things more complicated? KISS. YMMV |
Originally Posted by A37575
(Post 10427558)
A short test of reverse idle at an appropriate point before takeoff would have revealed this maintenance defect.. Another cue for good airmanship? . |
I agree with most of the posters here: it’s not a major issue 99.99% of the time should they not deploy, plus static use of of thrust reversers is not helpful in terms of FOD and/or surging. After all, if you’re going to check they work properly that involves full reverse...
|
Many aircraft require a pre-take-off reverser check as part of the taxi checklist. |
Originally Posted by josephfeatherweight
(Post 10427737)
Many aircraft require a pre-take-off reverser check as part of the taxi checklist. |
Forty+ years ago on the B707-436 with R-R Conway engines reverse was indeed checked on taxy out. Try that with a JT3D powered aircraft and you will be in a whole world of pain!
|
Originally Posted by A37575
(Post 10427647)
But could be a seriously big deal on a high speed rejected take off if runway limited..
- wet runway or worse - ASDA limited take-off - RTO at V+-10 to V1 The chances are very remote. For what is left, the standard walk around check of REV lock-out pins should cover. No need to envisage new procedures where at least 50% compliance with the present ones would do. Agreed? ----- although from the report: https://www.atsb.gov.au/media/577576...-064_final.pdf it is not clear whether the standard pin as seen here https://www.atsb.gov.au/media/577576...-064_final.pdf was visible on the outside of the casing. Now, the paragraph "AMM specific wording of HMU deactivated ..." of the report is the funny part. |
Originally Posted by A37575
(Post 10427558)
https://avherald.com/h?article=4c5b3f3d&opt=0
An A320 lands and reverse thrust fails to operate. There had been no prior warning flags in the cockpit. Maintenance staff had forgotten to remove the reverser lockout pins after servicing. The situation could have been critical if a high speed rejected takeoff occurred at the departure airfield and the crew were unaware the reversers had been locked out. |
The HCU is under the pylon on left side underneath the cowling, it isn't visible externally so can't detect incorrect HCU config during walk-around.
There is a streamer-free pin that lives up there and stays with the aircraft. that is what the engineers used to lock out the reversers and forgot to remove. Very sloppy maintenance. If I'm not mistaken, landing performance is predicated on braking action with nil reverser credit? (I'm not a pilot). |
Originally Posted by QuarterInchSocket
(Post 10427796)
Very sloppy maintenance. If I'm not mistaken, landing performance is predicated on braking action with nil reverser credit? (I'm not a pilot).
|
Thanks sonicbum. I forgot to ask. Would the takeoff run be the same?
|
Just follow SOPs
I agree with the ‘not a good idea’ crowd.
Also on every Boeing I’ve flown selecting REV on the ground deletes all your Vspeeds from the FMC. Keep It Simple, just follow manufacturer and company SOPs. The willingness not to, as alluded to by some of the questions on this forum, do make me worry about my fellow aviators. |
Originally Posted by atakacs
(Post 10427752)
Any specifics ? |
A proper walk around/cockpit preparation goes a long way to prevent stuff like this... Should’ve spotted the reverse lockout pins and all this discussion would be inexistent. As sonicbum said, might as well check everything every time, just in case. Reverse is not credited for RTO in dry runways, it is credited for wet or contaminated runways though |
Originally Posted by Meikleour
(Post 10427759)
Forty+ years ago on the B707-436 with R-R Conway engines reverse was indeed checked on taxy out. Try that with a JT3D powered aircraft and you will be in a whole world of pain!
Ok, I’ll bite, why is that ? |
All times are GMT. The time now is 04:06. |
Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.