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Old 5th Jan 2017, 19:37   #61 (permalink)
 
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If you allow the aircraft to yaw freely (castoring nosewheel) then I wonder if it has more tendency to roll in the opposite direction to the turn than if the nosewheel is sliding (resisting the yaw) - just a thought.
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Old 5th Jan 2017, 20:44   #62 (permalink)
 
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When landing a heavy plank wing with a steerable nosewheel when you let the nose drop and there is substantial weight on the nose wheel then the cams will ensure that you can only control its direction with nosewheel steering. In a severe crosswind this can lead to some deft fiddling with the tiller to keep it straight.

In this case I would have thought that the castoring nosewheel would have been a help rather than a hindrance.
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Old 6th Jan 2017, 00:53   #63 (permalink)


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Think there will be some concern about the deck surface failing. Wonder if the CAA will have some changes to CAP 437 regarding 'punching'.
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Old 6th Jan 2017, 02:01   #64 (permalink)
 
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Energy has to go somewhere: 12 tonnes flailing around. In this case, a significant amount has gone into deforming the deck.

Where else do you want it to go? We can have glass hard deck but then it's more likely that energy will carry the aircraft over the edge.
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Old 6th Jan 2017, 02:19   #65 (permalink)
 
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Crab,

Is there a difference between the reaction of an aircraft to the Castoring Wheel being in front of the mast or behind the mast as say in a 92 and a Wessex/61.....re Tipping Tendency?
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Old 6th Jan 2017, 04:10   #66 (permalink)
 
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PC2DLE.......

Is the 92 operated to PC1 or still the PC2DLE fudge?
From all accounts very fortuitous (!) the failure happened when it did and well done to the crew.


NOT SAYING IT IS THE CASE HERE - but got me thinking - intrigued on bearing load factors with a regular practice I have seen - almost a 'snatch' application of power as crews decelerate with min torque set (quickstop-esque) then apply power just before decision to 'make' the DPBL - albeit with a pinch of salt. Evident from 'newcomers' from other companies.
Cannot help but feel such a manoeuvre does not help situation.
Does CHC track such parameters on HOMPs - I ask because it is something our customer insist we monitor.......
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Old 6th Jan 2017, 09:50   #67 (permalink)
 
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Julie Andrews: Yes they do, for CHC they use FDM ( Flight Data Monitoring) to meet the requirements of HOMP.
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Old 6th Jan 2017, 10:50   #68 (permalink)
 
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Sasless - I don't think there is a difference - I was thinking about ground taxiing a 365 (castoring nosewheel) and how it rolls out of the turn when you yaw it. The same used to happen in the Wessex/Sea King (castoring tailwheel) - one Wessex student of mine many years ago got us up on two wheels (left main and tail) being a little spirited with his first ground taxiing!
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Old 6th Jan 2017, 11:32   #69 (permalink)
 
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Quote:
Is the 92 operated to PC1 or still the PC2DLE fudge?
How would that be relevant to the incident?
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Old 6th Jan 2017, 13:18   #70 (permalink)
 
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Quote:
the 92 operated to PC1 or still the PC2DLE fudge?
Julie, obviously you have never flown one or looked at the RFM.

Last edited by terminus mos; 6th Jan 2017 at 22:06. Reason: So that finals knows I know 212 man's background
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Old 6th Jan 2017, 14:11   #71 (permalink)
 
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I can't see either, like 212man, how PC1 or PC2DLE in this case is relevant.

Edited to take out comment "terminus mos: you clearly don't know 212man's background do you?" because I misread his post. Thanks for pointing this out 212man.

Last edited by finalchecksplease; 7th Jan 2017 at 09:10.
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Old 6th Jan 2017, 14:55   #72 (permalink)
 
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Quote:
terminus mos: you clearly don't know 212man's background do you?
I think you'll find he does (he may even have had dinner with me in Brunei ) and I think he was referring to Julie's comments
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Old 7th Jan 2017, 04:14   #73 (permalink)
 
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sorry gents - should have been a bit clearer.
I'm thinking about how different profiles require different applications of power and the individual's 'individualist' approach to applying them.
I have been sat in seat where pilot thought a quickstop and 'snatch' of power at the end was a good way of approaching and thought the geartrain would not 'like' it.
thank you for clarifying PC1 profile and HFDM following.
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Old 10th Jan 2017, 10:29   #74 (permalink)
 
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Breaking: Sikorsky grounds all S-92 helicopters after North Sea platform incident

Quote:
Written by Lee McCann and Niamh Burns - 10/01/2017 10:09 am

All North Sea helicopter flights have been grounded today over safety fears.

Sikorsky S92 helicopters have returned to base following a probe into a recent incident on a North Sea platform.

It’s understood the request to ground the S-92s was at the request of Sikorsky.

A spokesman for Aberdeen International Airport said: “We are aware of a safety alert that has been issued for all S92 helicopters and are anticipating a potential impact on helicopteroperations over the next few days until essential maintenance has been carried out. We will support the operators as much as possible through this disruption.”

The move comes after an incident involving an S-92 on a North Sea platform last month.

The helicopter flight had been making a shuttle flight between Total’s Elgin platform facilities and West Franklin, around 130 miles off the coast of Aberdeen.

Images later emerged of the damage to the platform as the flight attempted to land with nine passengers and two crew on board.

A source at the time said the S-92 took “gouges out” of the helideck, damaged its wheels and spun on the deck of the West Franklin when it was forced to land.

The decision to ground S-92s comes after Super Pumas were banned in the wake of a North Sea helicopter crash off the coast of Norway which killed 13 people on April 29th last year.

Last edited by Senior Pilot; 10th Jan 2017 at 10:34. Reason: Add quote
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Old 10th Jan 2017, 10:52   #75 (permalink)
 
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Fleet of 225's seen heading up the A90 to Aberdeen.
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Old 10th Jan 2017, 10:59   #76 (permalink)
 
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Sikorsky grounds S92 helicopters for checks after incident - BBC News
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Old 10th Jan 2017, 11:11   #77 (permalink)
 
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And HUMS close monitoring of the Tail Rotor Pitch Change Bearing is now required.


Sikorsky taking the lead from Airbus?
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Old 10th Jan 2017, 11:21   #78 (permalink)
 
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Anyone got a copy of the Safety alert /SB to share?
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Old 10th Jan 2017, 12:30   #79 (permalink)
 
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Can we assume that this grounding includes SAR S92's ?
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Old 10th Jan 2017, 12:40   #80 (permalink)
 
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Quote:
Originally Posted by pitch horn View Post
Can we assume that this grounding includes SAR S92's ?
It's not a grounding - it's a once off inspection followed by increased HUMS surveillance (more frequent downloads). Yes, SAR aircraft must comply too.

S92A Alert Service Bulletin - HeliOffshore

Last edited by 212man; 10th Jan 2017 at 12:52.
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