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freezingbore
23rd Mar 2009, 11:39
found MD11 main landing gear extention and retraction actuator hyd leek at the seal and retainer,not obviously,but in one hour a drop will come out.Could some one tell me does it matter,what should i do?
Thanks.

IFIX
23rd Mar 2009, 12:59
One drop an hour is not a big deal, as the amm will tell you.
Insert the gear pins (ALL of them please!) and select the gear up hydraulically, you will quite likely have a large increase in leak rate...

Remember this actuator is pressurized the entire flight (well as long as the gear is up).
The actuator has a spare seal, but swapping it out can be a handfull as the torque on the retainer is REALLY high.
Replacing the actuator at homebase will be the way to go, if current leak rate allows it to be scheduled.

The actuator is a heavy thing and at least a bucket and a half of skydroll will be headed your way after disconnecting.

Be safe, IFIX

freezingbore
23rd Mar 2009, 14:37
Thank you,IFIX

HAWK21M
29th Mar 2009, 08:30
One drop in 60 secs seems within limits but regular monitoring would be needed to identify an increase in leak or drop in qty.
The AMM will list the tolerences.

regds
MEL.

Terry McCassey
29th Mar 2009, 12:16
Do not take advice from any-one on a public forum - read the AMM. Keep safe !

DBate
29th Mar 2009, 15:58
Do not take advice from any-one on a public forum - read the AMM. Keep safe !

That is exactly what I was thinking. :ok:

muduckace
30th Mar 2009, 00:20
That big cylinder on the gear that is leaking 1 drop per minute is actually the retract actuator, after the unlock cylinder "little one look up" locks the linkage over center the actuator has no significant pressure on it.

The upside to your delema is after you dump a hydraulic system gravity should lock the gear down so you can do an air turnback.

Wanna have some fun, pin the gear (all of them please), put the handle up and watch the actuator blow fliud all over the ramp.

Some of this is serious some humor, but all is for REFRENCE ONLY.


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