Careful if you lose hydraulics

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pelmet
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Careful if you lose hydraulics

Post by pelmet »

Remember, when you feather with no brakes or on a slippery surface, you will move forward. Taxiing without hydraulics is risky anyways. Get towed in if you can.

A08A0062: The Saab SF340-A aircraft, registration C-GYQM, operating as Prince Edward Air flight CME174 was on a scheduled cargo flight from Deer lake, NL to Gander, NL. On departure from Deer Lake, and when the landing gear was retracted, the hydraulic caution light illuminated. The crew completed the QRH checklist, turned off the hydraulic pump, and diverted to St. John's where maintenance was available. On approach to St. John's, the hydraulic pump switch was moved to the override position for gear extension and the gear extended to the down and locked position, however, the hydraulic quantity indication had now dropped to below the green arc. An uneventful landing was carried out on runway 11 and the aircraft was slowed to a safe taxi speed by using reverse thrust. Since braking and nose wheel steering were still available, it was decided to taxi to the hangar. Upon reaching the hangar apron, the propellers were feathered, however, as the propellers were moving to the feather position some thrust was produced and the aircraft continued moving forward. By this time, the hydraulic fluid was depleted and braking was no longer available. The aircraft continued to roll forward until it struck a hangar causing substantial damage to the nose of the aircraft and minor damage to the hangar. There were no injuries to the crew. Maintenance found that a "banjo fitting" on the return side of the right main gear down lock actuator had failed
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Galaxy
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Re: Careful if you lose hydraulics

Post by Galaxy »

That's where having some bush time would have helped i.e. float or ski flying!!
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black hole
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Re: Careful if you lose hydraulics

Post by black hole »

I hate banjo fittings!!!

BH
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Liquid Charlie
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Re: Careful if you lose hydraulics

Post by Liquid Charlie »

maybe an improved SOP and/or comments and advisory items on the QRH would have prevented the incident.
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J31
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Re: Careful if you lose hydraulics

Post by J31 »

Liquid Charlie wrote:maybe an improved SOP and/or comments and advisory items on the QRH would have prevented the incident.
Maybe some common sense :?. The gear extension, brakes and steering use hydraulics’ which is low :idea:....land, stop, chock it, and shut it down. Then install the gear pins and tow to the hangar :!:
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Liquid Charlie
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Re: Careful if you lose hydraulics

Post by Liquid Charlie »

Maybe some common sense :?. The gear extension, brakes and steering use hydraulics’ which is low :idea:....land, stop, chock it, and shut it down. Then install the gear pins and tow to the hangar :!:
Too bad it isn't that simple -- "one man's common sense is another man absurdity" in any given situation. I'm sure these guys fully believed they were using good common sense by clearing the runway and saving all the hassle of getting a tug out to haul them away. 20/20 hindsight is very easy and people can sit here and point at individual pilots BUT you can be sure that if this company's SOP dictated the aircraft be shutdown and towed after any hydraulic failure this thread should not be happening. If it did well likely everyone would advance one more number :smt040

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Company Itin
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Re: Careful if you lose hydraulics

Post by Company Itin »

[quote="cpt sweet'njuicy"]http://www.youtube.com/watch?v=tTv6CAmCO8I[/quote]

Cpt S&J,

I didn't recongnise you. Its been a while. I see you've grown a mustache, and gotten even better at the Banjo. :) HAHA j/k
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Spinner
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Re: Careful if you lose hydraulics

Post by Spinner »

Just curious as to where the TSB report came from?
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AntiNakedMan
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Re: Careful if you lose hydraulics

Post by AntiNakedMan »

Spinner wrote:Just curious as to where the TSB report came from?
It's a cut and paste from the CADORS
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AuxBatOn
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Re: Careful if you lose hydraulics

Post by AuxBatOn »

I thought hydraulic fluid was flamable. Why risking a fire by taxiing to the hangar when you can shut down on the taxiway and let the guys pull your airplane??

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bobcaygeon
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Re: Careful if you lose hydraulics

Post by bobcaygeon »

Transport airplanes use skydrol for hydraulic fluid which is non-flammable and is required due to the relatively large quantities of fluid transport a/c require. (It's toxic as hell but doesn't absorb moisture as badly as petroleum based fluid. It also strips paint, so often aircraft have paint missing from their bellies if they have had a leak, particularily from the gear)
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Jaques Strappe
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Re: Careful if you lose hydraulics

Post by Jaques Strappe »

Does the park brake not have an accumulator? Most do.
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Spinner
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Re: Careful if you lose hydraulics

Post by Spinner »

AntiNakedMan wrote:
Spinner wrote:Just curious as to where the TSB report came from?
It's a cut and paste from the CADORS

Actually it's not.

this is the CADOR report

UPDATE Commercial & Business Aviation: The aircraft departed Deer Lake and upon selecting gear up, the hydraulic light and the annuciator came on. The captain immediately shut the hydraulic pump off as per memory checks. After completing the checklist it was determined that they had a hydraulic leak in the system. The main accumulator still had some fluid so they decided to bypass Gander and continue on to St. John's where the weather was better. Landing was normal. The captain had some steering and soft brakes. The captain decided to taxi the aircraft onto the ramp area. He feathered the propeller about 150 feet from the hangar. The forward thrust from the props going into feather gave the aircraft some forward momentum. With the slight downgrade the aircraft rolled until it hit Hangar 3. The captain had no brakes or steering. There is substantial damage to the nose cone area. The aircraft will be out of service for two to three weeks.
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"LIFE IS NOT A JOURNEY TO THE GRAVE WITH THE INTENTION OF ARRIVING
SAFELY IN A PRETTY AND WELL PRESERVED BODY, BUT RATHER TO SKID IN BROADSIDE, THOROUGHLY USED UP, TOTALLY WORN OUT, AND LOUDLY PROCLAIMING"

WOW... WHAT A RIDE
Four1oh
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Re: Careful if you lose hydraulics

Post by Four1oh »

Jaques Strappe wrote:Does the park brake not have an accumulator? Most do.
it should have, but in the case of hydraulic failure, every plane I've ever flown that have them are VERY specific in the POH that you only have the guarantee of stopping the aircraft on the runway, as long as you use the proper stopping technique. You're supposed to set the brakes, shutdown and get towed in from there.(the planes I flew)
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ever
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Re: Careful if you lose hydraulics

Post by ever »

"Remember, when you feather with no brakes or on a slippery surface, you will move forward."

Wouldn't you roll backwards?
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boeingboy
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Re: Careful if you lose hydraulics

Post by boeingboy »

Why would you roll backwards?

The props go from fine pitch - THROUGH course pitch to get to feather. Putting more pitch on the blades makes you go forward.
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ever
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Re: Careful if you lose hydraulics

Post by ever »

Whoops my bad, Youre absolutely right, disregard.
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AuxBatOn
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Re: Careful if you lose hydraulics

Post by AuxBatOn »

I'm curious why the crew decided to go ahead and taxi with hydraulic problems... What's the big deal with shutting down on the taxiway and wait for someone to pick you up??

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The Hammer
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Re: Careful if you lose hydraulics

Post by The Hammer »

That would be a training/ company mentality issue.
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Four1oh
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Re: Careful if you lose hydraulics

Post by Four1oh »

The Hammer wrote:That would be a training/ company mentality issue.
exactly. company culture... once again.
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