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-   -   Twin Otter vs Squirrel at St Barts, 24-08-2023 (https://www.pprune.org/accidents-close-calls/654412-twin-otter-vs-squirrel-st-barts-24-08-2023-a.html)

treadigraph 24th Aug 2023 20:39

Twin Otter vs Squirrel at St Barts, 24-08-2023
 
Air Antilles Twin Otter ran off the runway and amputated a wing against a parked Squirrel at St Barthelemy - all on the Twotter seem to have escaped unharmed.

https://aviation-safety.net/wikibase/344872


Pilot DAR 25th Aug 2023 01:20

Oh dear! It's nice to hear that there were no injuries in the Twin Otter, hopefully also in the AS350. Twin Otters can be a little demanding to steer on the ground (because it would appear that the pilot had left the runway by a hundred feet!). It's hard to see what the nosewheel steering was doing, but I don't see any appreciable amount of rudder being applied in an attempt to get the plane away from the apron.

Bksmithca 25th Aug 2023 02:16

Darn they grow those squirrels big in St Barts. Pilot must have SQUIRREL

dixi188 25th Aug 2023 17:05

Fortunately the Twin Otter's fuel is in tanks under the cabin floor.

treadigraph 25th Aug 2023 18:10

Wonder if the right prop failed to go into beta?

punkalouver 25th Aug 2023 18:57


Originally Posted by dixi188 (Post 11491483)
Fortunately the Twin Otter's fuel is in tanks under the cabin floor.

Obviously, you haven't flown one with wingtip tanks. All the ones i flew had them. The fueling guys where we were based didn't seem to like them as they made the pilots stand way up on a ladder to refuel them.

nevillestyke 25th Aug 2023 20:35

Investigation
 
NTSB or RSPCA?

Lake1952 25th Aug 2023 21:13

This was on the taxiway/ ramp. Not sure if video was sped up, but it looks inexplicable!

https://aviationsourcenews.com/incid...nt-barthelemy/

dixi188 26th Aug 2023 06:51


Originally Posted by punkalouver (Post 11491543)
Obviously, you haven't flown one with wingtip tanks. All the ones i flew had them. The fueling guys where we were based didn't seem to like them as they made the pilots stand way up on a ladder to refuel them.

Didn't know there was a tip tank option. The only time I saw extra fuel was when we fitted 10 drums in the cabin for a ferry flight to New Zealand around 1985.

dixi188 26th Aug 2023 06:58

Not a lot of space if something goes wrong. The helipad is only about 90ft off the edge of the runway. We had a Twin Otter burst a tyre at Newcastle and that ended up on the grass.

212man 26th Aug 2023 14:24


Originally Posted by Lake1952 (Post 11491603)
This was on the taxiway/ ramp. Not sure if video was sped up, but it looks inexplicable!

https://aviationsourcenews.com/incid...nt-barthelemy/

Not in the context of the fact that the Twin Otter had departed the runway!

Concours77 26th Aug 2023 17:19

Tough Helo? Wimpy DeH? Main spar snapped hitting a helicopter?
V/helo...?

FlexibleResponse 27th Aug 2023 04:57


Originally Posted by Concours77 (Post 11492000)
Tough Helo? Wimpy DeH? Main spar snapped hitting a helicopter?
V/helo...?

After the FWD spar has separated at the attachment, the MAIN spar has then failed in the drag direction...aft.

The MAIN spar did not fail in the lift direction...upwards.

The design criteria for the MAIN spar is so much stronger to withstand Lift forces than for Drag forces.

So hitting a stationary helicopter mast at 30 odd knots would seem to well exceed the designers wing Drag force calculations!

Capn Bloggs 27th Aug 2023 14:07


Originally Posted by Flexible Response
After the FWD spar has separated at the attachment, the MAIN spar has then failed in the drag direction...aft.

A flexible response then... :E​​​​​​​

VH-MLE 28th Aug 2023 00:14

Who do the cops think they are not wearing high viz vests…

Pilot DAR 28th Aug 2023 00:19


Wimpy DeH? Main spar snapped hitting a helicopter?
V/helo...?
By allowing the wing(s) to break off in drag, deceleration forces to the occupants of the plane can be reduced during a crash. In any normal operation, the wing to fuselage upper attachments should always be in compression. The Twin Otter's wing attachment was a problem in the reverse sense, when, for the earlier Twin Otters, the fuselage came to a sudden stop during a crash. The aft wing to fuselage attachments could fail, which could result in the engines impacting the cockpit. For this, DHC designed and installed the "Pilot Saver" modification, which was a tierod between the aft wing's fittings, so that the wings would not fail moving forward. As seen having a wing fail moving aft is less concern, as it moves away from the fuselage.


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