If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Grob 103 Canopy release failure
Our club Grob 103 Twin III canopy lock/unlock mechanism (front seat) failed on the ground when someone tried to open it. Upon close inspection, one of the 2 hidden bolts closest to the handle had gradually been cut through by the lever action to the breaking point. Though we found a way to replace the bolt, we may want to inspect the other bolts in both front and rear canopies. The problem is that the manufacturer glassed in both mechanisms and there does not seem to be a way to effect inspection other than to cut into the frames. Does anyone have a clue as to how to do this? Have there been reports of similar issues with these models? I can't seem to find any AD's on it.
Here are some pictures of the mechanism taken by a Grob owner in Sweden in 2007 of a damaged frame with a window cut out to make repairs: http://syntaxsociety.se/~wed/flyg/progress.html Thanks, Mike |
#2
|
|||
|
|||
Grob 103 Canopy release failure
First off, you should report this to the Federallies. The canopy frame can be opened up by carefully cutting a hole in the problem area, then replace the worn / broken bolts, then close it up by gluing in a backing plate which can be a "donut" shape. After the backing plate cures, then glue in a skin replacement (which can be the original piece ) if you were careful when opening up the frame. Fill and paint and she's ready to go. If your not comfortable with any of this, your frame should probably see a sailplane Doctor..
Have fun, JJ |
#3
|
|||
|
|||
Grob 103 Canopy release failure
Your suggestion to report this to the Feds is worth serious consideration, particularly since the locking mechanism cannot be inspected without cutting into the frame. The "catch 22" is a bit rhetorical; what would prompt anyone from creating a window to inspect the thing unless there was already a problem? An A/D? For each Grob of this type, there are 4 bolts to check for each of the 2 canopies. Not much of a problem on the ground, but if you wanted to egress at altitude, the unlocked left side may prevent bailout even though the right-side emergency release worked.
Good thoughts, Thanks. Mike |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Double Release Failure on Tow | Piet Barber | Soaring | 20 | June 8th 16 07:31 PM |
Tost release failure | Bill D | Soaring | 24 | August 20th 13 10:49 AM |
TOST Release Failure - Two Uncommanded Release's | [email protected] | Soaring | 11 | October 13th 12 10:23 AM |
Grob 102 Astir CS Canopy | GARY BOGGS CFIG | Soaring | 1 | October 3rd 09 06:49 PM |
Double Release Failure | ZZ | Soaring | 35 | September 11th 09 03:29 AM |