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767 out of YBCS today.

 
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Old 13th Jul 2002, 07:17
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Question 767 out of YBCS today.

Heard a remark today from a 767 crew to the Cairns tower it went along the following lines:

767: ...you might notice our gear will be a little slow to retract today, there is no cause for alarm...

Tower said that was ok.

What would be the reason for this slow gear problem anyone?
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Old 13th Jul 2002, 09:55
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Possible Hot Brakes due to short turnaround. May have just wanted to dangle the feet in the cool for a bit longer.
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Old 13th Jul 2002, 10:08
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Wouldnt taxi if brakes too hot, as this would effect RTO performance.
I think more than likely that the Air Demand Pump (ADP), was u/s.
Centre hydrualic system has a bleed air powered ADP, Which in auto mode comes on to assist in powering the centre system with heavy load items, ie; gear, flaps/slats, spoilers etc.
Gear retraction may take up to 3 mins? ( I think, ground school was a while ago), which obviously has an effect on climb performance and therefore RTOW.

Maybe the answer.
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Old 13th Jul 2002, 11:39
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The takeoff weights are invalidated if the gear is left down - but that really is irrelevant because if there were 2 engines running the RTOW doesn't, strictly speaking apply either..

By that I mean the RTOW weights are the weights that the aeroplane can lift if it suffers a failure at Vef and continues, these weights being predicated on a number of things, one of which is the gear being up.

If the gear couldn't be retracted immediately if required a new RTOW chart that accounts for the penalty would be required, but that would SERIOUSLY limit the weights - assuming that one could be calculated by ops engineering, or you wouldn't go.
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Old 13th Jul 2002, 11:45
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It would have been the C system ADP U/S.

The gear just comes up a little slower than normal. Surprised he even mentioned it to the Tower. It ain't no biggie.
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Old 13th Jul 2002, 11:49
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The MEL permitting dispatch with the Centre Hydraulic system Air Driven Pump (ADP) inoperative details the performance penalties that must be applied. The max RTOW is significantly reduced because of the degraded 2nd segment, however, if the aircraft was operating on a domestic sector then the actual TOW would be much much lower than the new RTOW.

L84Wrk is correct in his post as the two electric pumps on the Centre Hydraulic system would retract the gear normally except that with a lower flow rate it may take up to 3 minutes.
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Old 14th Jul 2002, 01:58
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or.....one brake inop....equals no autobraking during gear retraction....equals gear left down for two minutes after takeoff to allow wheel spindown....equals 18,000kg performance penalty!
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