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Aaron747
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Airbus Experts - What Happened Here?

Sun Apr 14, 2013 2:06 pm

Gentlemen,

I was at NGO today and saw something quite interesting on this CZ A319. At first I thought the crew were just having checklist issues because they were a bit lost while they taxied in from runway 18, and had wingtip strobes still on until just before they found the gate. Then I noticed the spoilers were still extended and stayed that way as they parked and shut everything down.

http://sphotos-b.ak.fbcdn.net/hphotos-ak-ash3/558753_3092240242108_814309663_n.jpg

Once the hydraulics went, the spoilers fell into their retracted position. Except for this one (it stayed in this position until the aircraft pushed and started engines for its return to Shenzhen):

http://sphotos-d.ak.fbcdn.net/hphotos-ak-prn1/524223_3092240202107_693066364_n.jpg

Is there a particular reason why this would happen?

Just a mild curiosity, thanks!
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bueb0g
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RE: Airbus Experts - What Happened Here?

Sun Apr 14, 2013 8:33 pm

Interesting... Could be that the crew just forgot, maybe if they had an extended taxi down a runway following landing so left the strobes on? Spoilers is interesting, I don't know of a fault that would cause that. Unless there was a request from someone that the pilots leave the spoilers up I would say that the crew probably just missed part of the after landing flow.
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zeke
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 12:50 am

Sounds like improper after landing flow. Lights are the PMs job, probably realised they were on when they went to turn off the taxi light. Spoilers are the PFs job after clearing the runway.
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B6JFKH81
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 2:10 am

Quoting bueb0g (Reply 1):
Spoilers is interesting, I don't know of a fault that would cause that.

S.E.C. faul/fail maybe? Not sure if that would leave them deployed or not though.
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Aaron747
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 2:38 am

Yeah I was just wondering what could account for just one panel remaining half extended for 1 hour until the aircraft was powered up for the next flight.
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B6JFKH81
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 3:06 am

I'll talk to some techs tomorrow when I get to the hangar to see what could have caused that (my airline has a large fleet of A320's), see if they have any input for your Aaron747. Something is telling me there was an SEC or actuator issue.
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AA737-823
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 5:06 am

Quoting Aaron747 (Reply 4):

Yeah I was just wondering what could account for just one panel remaining half extended for 1 hour until the aircraft was powered up for the next flight.

Not enough residual pressure to pull them down when the handle finally gets stowed.
I see this on other airplanes in the hangar fairly frequently- if you don't bother to turn the pumps on, then the easy ones will come down, while the actuator that presents the most resistance will stay up until real pressure is applied.

That's my best guess, anyway.
 
bueb0g
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 8:57 am

Quoting zeke (Reply 2):
Spoilers are the PFs job after clearing the runway

With many airlines, de-arming the spoiler is the PF's job during the exit from the runway with is a prompt to the PM to begin the after landing flow. In this case I'd say it's likely that this was the case and the Capt just forgot to do his after landing stuff, as that would explain both strobes and spoiler.
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rmm
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RE: Airbus Experts - What Happened Here?

Mon Apr 15, 2013 10:04 pm

Sometimes strobes are left on if the red beacon is on MEL
 
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Aaron747
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RE: Airbus Experts - What Happened Here?

Tue Apr 16, 2013 12:43 am

Quoting rmm (Reply 8):
Sometimes strobes are left on if the red beacon is on MEL

The red beacon was operational.

Quoting AA737-823 (Reply 6):
Not enough residual pressure to pull them down when the handle finally gets stowed.
I see this on other airplanes in the hangar fairly frequently- if you don't bother to turn the pumps on, then the easy ones will come down, while the actuator that presents the most resistance will stay up until real pressure is applied.

That makes sense to me. I suppose the panels themselves must be pretty lightweight and would not come down on their own if the actuator arm is still extended.
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ArmitageShanks
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RE: Airbus Experts - What Happened Here?

Tue Apr 16, 2013 3:39 am

I had the same thing happen on a Tokyo-Beijing flight on a NW A330 back in 2007. Flaps went up after landing but spoilers stayed up all the way to the gate. Not sure what happened after shutdown as I was in the isle. Never figured out why.
 
NDWDCPGUY
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RE: Airbus Experts - What Happened Here?

Thu Apr 18, 2013 12:15 am

Not that uncommon for a landing aircraft to taxi to the stand using idle power only. Advancing the power levers returns auto spoilers to the stow position. The power levers may not have been advanced after landing. Flt crew often forget to turn off wing tip strobe lights after landing.
 
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Aaron747
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RE: Airbus Experts - What Happened Here?

Thu Apr 18, 2013 1:12 am

Quoting NDWDCPGUY (Reply 11):
The power levers may not have been advanced after landing.

Power was definitely added after landing. They got lost on the way to the gate and made like a bat out of hell once they knew where they were going.
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bueb0g
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RE: Airbus Experts - What Happened Here?

Thu Apr 18, 2013 8:49 am

Quoting NDWDCPGUY (Reply 11):
Not that uncommon for a landing aircraft to taxi to the stand using idle power only. Advancing the power levers returns auto spoilers to the stow position

Not on an airbus (at least not until something like 75% thrust is added)
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autothrust
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RE: Airbus Experts - What Happened Here?

Thu Apr 25, 2013 9:24 am

Quoting AA737-823 (Reply 6):
if you don't bother to turn the pumps on, then the easy ones will come down

Wouldn't it suffice to enable the PTU to get more pressure so the PF can retract the spoilers?
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