Positive rate From Australia, joined Sep 2001, 2143 posts, RR: 1
Reply 1, posted (11 years 7 months 1 week 1 day ago) and read 5112 times:
May 26 1991 Lauda Air flight NG004 departed Bangkok for Vienna. Whilst on climb through FL 247 the left engine thrust reverser deployed which then overstressed the airframe and caused the aircraft to break up. I believe it was an electrical problem which caused the reverser to inadvertently deploy.
AJ From Australia, joined Nov 1999, 2402 posts, RR: 25
Reply 3, posted (11 years 7 months 1 week 21 hours ago) and read 5075 times:
Boeing 767-3Z9(ER) OE-LAV "Wolfgang Mozart" had ongoing problems with her left engine thrust reverser system.
Climbing out of Bangkok the 'REV ISLN' light illuminated several times as the reverser started to deploy and was restowed by the auto-restow function. Eventually the reverser sleeve opened, and due to the mounting of the engine forward of the wing airflow was disrupted and great stress was applied to the airframe.
The aircraft completely broke up 29 seconds after the thrust reverser deployed. Investigators claim that their was only six seconds where the aircraft could have been saved, impossible for the unsuspecting crew.
Duncan From United States of America, joined Apr 2002, 131 posts, RR: 0
Reply 5, posted (11 years 7 months 5 days 9 hours ago) and read 4712 times:
This incident also prompted the various AD's to install a third line of defence for ALL commercial aircraft T/R's. Previously there was only one level of failsafe designed into the T/R system, now there are two levels (i.e there has to be two separate system/component failures before the T/R is at risk of deploying if another system/component fails) or, in other words, an additional level of redundancy.
Air2gxs From , joined Dec 1969, posts, RR:
Reply 7, posted (11 years 7 months 4 days 13 hours ago) and read 4585 times:
What is "arming the thrust reverser". I've heard of arming the speed brakes but reversers are inhibited in the air. The only exception I know about is the DC8 which allows deployment under certain operational circumstances.
This is an excerpt from the B767 AMM and is fairly typical of transport cat. airliners:
"An electrical circuit to operate the thrust reverser pressure regulating and shutoff valve (PRSOV) to provide pneumatic pressure to the reverser actuation system. The electrical circuit also prevents reverser operation unless these required operating conditions are met: (a) The air/ground relays are in the ground position. (b) The fire switch is in the normal position. (c) The thrust reverser position switches are in the reverser stowed position."