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Forum: Rotorheads

18th Jan 2017, 01:41

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

Satcom With the expense to do the inspection...

Satcom

With the expense to do the inspection and the $4M+ per seat liability, if a reinstalled bearing fails, no rationale person would ever reuse even a slightly degraded bearing or one that is...

Forum: Rotorheads

16th Jan 2017, 17:15

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

Variable Variable, If this is the case...

Variable

Variable,

If this is the case then the system is useless until it has an automatic at download alerting capability. Having to rely on Sikorsky for go/no go decisions after every...

Forum: Rotorheads

16th Jan 2017, 16:22

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

[QUOTE]11 bearings have been removed however none...

[QUOTE]11 bearings have been removed however none showing any distress like incident bearing.[QUOTE]

This alone proves the HUMS as implemented can not be relied on to reliably catch this fault for...

Forum: Rotorheads

13th Jan 2017, 23:05

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

Mitch I well know HUMS detects faults. I...

Mitch

I well know HUMS detects faults. I was specifically talking about accidents (North Sea) where people point fingers at operators while believing HUMS is infallible. In accidents where the...

Forum: Rotorheads

13th Jan 2017, 20:49

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

The post mortum of most, if not all, detectable...

The post mortum of most, if not all, detectable drive system faults that led to an accident were "missed" not by operator error, but by:

1. System diagnostic programming errors which showed...

Forum: Rotorheads

3rd Jan 2017, 23:15

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

Marv, (sorry) It is a condition indicator...

Marv, (sorry)

It is a condition indicator looking at a spectrum of vibration at discrete frequencies or over a specific broad frequency range. As bearings fail or are loaded abnormally the...

Forum: Rotorheads

31st Dec 2016, 22:52

Replies: 218

S92 "unexpected control responses"

Views: 120,098

Posted By The Sultan

Mitch, This has happened a lot more than...

Mitch,

This has happened a lot more than twice unless there is another tail rotor bearing that fails and requires a run on landing due locked or loss of thrust. I heard of two back six or so...

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