767-400 777 Pratt. Rumors
04-02-2021, 04:58 AM
#51
Gets Weekends Off
Joined APC: Oct 2005
Position: Trying not to crash
Posts: 1,260
When I was in 777 school I was told that had the HNL incident happened closer to the critical point, they wouldn’t have made it due to the increased drag and burn. Having an engine fail is one thing, having it blow large pieces of the airplane off is another. We have had two of these incidents now. The feds won’t allow a Band-aid fix and will require more inspections going forward that might prove to be cost prohibitive on old planes. It’s a bad deal. 52 aircraft is a huge chunk of the fleet.
Sent from my SM-N975F using Tapatalk
04-02-2021, 05:19 AM
#52
Gets Weekends Off
Joined APC: Aug 2020
Posts: 2,320
Both aircraft could climb, maintain altitude, etc. The problem is that the ETOPS fuel requirements at the critical point are based on a normal shutdown, not a massive failure with significantly increased drag. If the feds just require new blades and inspections, we could be in business. If the cowl has to be redesigned, we could have big problems.
04-02-2021, 05:29 AM
#53
Gets Weekends Off
Joined APC: Apr 2008
Position: Sleeping in the black swan’s nest.
Posts: 5,725
04-02-2021, 05:31 AM
#54
Gets Weekends Off
Joined APC: Jun 2007
Position: 767/757 CA
Posts: 2,701
Both aircraft could climb, maintain altitude, etc. The problem is that the ETOPS fuel requirements at the critical point are based on a normal shutdown, not a massive failure with significantly increased drag. If the feds just require new blades and inspections, we could be in business. If the cowl has to be redesigned, we could have big problems.
04-02-2021, 05:44 AM
#55
Gets Weekends Off
Joined APC: Aug 2020
Posts: 2,320
Like Dave said, replacing the blades is one thing, a problem with the cowl getting blown off when they fail is another. I have no idea how much extra drag the cowling blowing off makes, but according to my instructors it was enough to make getting to a runway unlikely if you are close to the critical point when it happens. If the feds allow the blades to be replaced with no other modifications, the fix is fairly simple and quick. If they require that the cowling be modified, tested, and proven to be able to withstand blade failures without coming apart, the fix may be time consuming and cost prohibitive.
04-02-2021, 05:46 AM
#56
Gets Weekends Off
Joined APC: Apr 2008
Position: Sleeping in the black swan’s nest.
Posts: 5,725
Like Dave said, replacing the blades is one thing, a problem with the cowl getting blown off when they fail is another. I have no idea how much extra drag the cowling blowing off makes, but according to my instructors it was enough to make getting to a runway unlikely if you are close to the critical point when it happens. If the feds allow the blades to be replaced with no other modifications, the fix is fairly simple and quick. If they require that the cowling be modified, tested, and proven to be able to withstand blade failures without coming apart, the fix may be time consuming and cost prohibitive.
04-02-2021, 06:39 AM
#58
Gets Weekends Off
Joined APC: Jun 2007
Position: 767/757 CA
Posts: 2,701
Like Dave said, replacing the blades is one thing, a problem with the cowl getting blown off when they fail is another. I have no idea how much extra drag the cowling blowing off makes, but according to my instructors it was enough to make getting to a runway unlikely if you are close to the critical point when it happens. If the feds allow the blades to be replaced with no other modifications, the fix is fairly simple and quick. If they require that the cowling be modified, tested, and proven to be able to withstand blade failures without coming apart, the fix may be time consuming and cost prohibitive.
04-02-2021, 07:06 AM
#59
Gets Weekends Off
Joined APC: May 2009
Posts: 1,860
When I was in 777 school I was told that had the HNL incident happened closer to the critical point, they wouldn’t have made it due to the increased drag and burn. Having an engine fail is one thing, having it blow large pieces of the airplane off is another. We have had two of these incidents now. The feds won’t allow a Band-aid fix and will require more inspections going forward that might prove to be cost prohibitive on old planes. It’s a bad deal. 52 aircraft is a huge chunk of the fleet.
04-02-2021, 07:06 AM
#60
Gets Weekends Off
Joined APC: Dec 2008
Position: 320 Captain
Posts: 655
The cowling issue(s) was(were) already under review. For as along as two years ago per new reports. (Not just the 777 but also the 737)
https://simpleflying.com/boeing-777-...-cover-change/
Boeing has decided to redesign the fan cowl instead of trying to modify existing fan cowls to address both the structural strength concerns and moisture issues … Boeing will be manufacturing new fan cowls and providing service instructions for operators to remove and replace the fan cowls.”
Thread
Thread Starter
Forum
Replies
Last Post
cashcow
Cargo
7
03-08-2007 12:43 PM
