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HAWK21M
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Damage To Static Port Area - Rvsm Compromised.

Thu Mar 29, 2012 9:54 am

In case there is an unfortunate damage to the RVSM area around the static port area,which is beyond go limits needing a patch repair under the Static port & expanding outwards say approx 3-4 inches,but since the patch in the RVSM zone....What transpires.

Will that Aircraft always be required to fly NON RVSM or how can RVSM status be restored on that Aircraft?.
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fr8mech
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RE: Damage To Static Port Area - Rvsm Compromised.

Thu Mar 29, 2012 12:28 pm

The local engineering department, in accordance with manufacturer and regulatory guidance, will make the final determination as to the repair scheme. But, I have seen a small area of damage enlarged so that the repair area grows. It's quite possible and likely that a flush repair be ordered instead of a doubler/tripler as the case may be.

I can't imagine that an operator would even consider remaining non-RVSM for a long period.
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 6:22 am

Quoting fr8mech (Reply 1):

I can't imagine that an operator would even consider remaining non-RVSM for a long period.

They would not.....Hence extending the patch over a larger area,thereby making the RVSM smooth area available makes sense.
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737tdi
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 7:17 am

If I recall correctly on the 737, the existing static port would be removed then a repair large enough to regain distance limits around/over the port would be installed, then a new port would be installed and spotfaced to limits. With the SRM changing quite a bit it may have changed since the last time I saw it done.
 
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 9:44 am

Quoting 737tdi (Reply 3):

Thats what I think too....If the patch covers the entire static area requiring to be dent free & reinstallation of the Static port over the patch,it should be ok.
However I've noticed a couple of aircraft flying RVSM & having a patch stretching only 3-4 inches in the RVSM zone.I'll try & get a pic if I come accross the Aircraft in future.
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767eng
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 12:52 pm

I'm not sure, I've seen a couple of aircraft with scab patches encroaching into the RVSM area around the static ports but still flying RVSM with the repair approved and permanent.

We've also replaced and entire skin panel on a 320 because someone hit the RVSM area with a set of steps and dented it badly.
 
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 4:28 pm

What is the Regulation say.........The RVSM Zone should not be compromised,so obviously the patch should extend outside the zone.
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fr8mech
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RE: Damage To Static Port Area - Rvsm Compromised.

Fri Mar 30, 2012 5:21 pm

Quoting HAWK21M (Reply 6):
The RVSM Zone should not be compromised,so obviously the patch should extend outside the zone.

If the engineering department says it's ok, then it's ok. Their repair schemes do go in front of the FAA (here is the US) for oversight.
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boeing767mech
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RE: Damage To Static Port Area - Rvsm Compromised.

Sat Mar 31, 2012 6:19 am

Quoting fr8mech (Reply 1):
I can't imagine that an operator would even consider remaining non-RVSM for a long period.

Depends on the carrier and the aircraft's mission, my little bankrupt carrier has a 757 that has been out of RVSM complience for a couple of years now because of a dent in the RVSM critral inspection area. Since this aircraft is a NON-ETOPS and NON-OVERWATER aircraft and the damage is allowable without a repair. The company doesn't want to spend the money to repair the dent to make the airplane RVSM qual'd

David
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Sat Mar 31, 2012 9:48 am

Quoting fr8mech (Reply 7):
If the engineering department says it's ok, then it's ok

shouldn't it be approved by the Manufacturer & regulatory first,if its not in the repair scheme,before engineering/Maintenance can give the goahead.

Quoting boeing767mech (Reply 8):
dent in the RVSM critral inspection area.

where is the dent exactly?.
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tdscanuck
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RE: Damage To Static Port Area - Rvsm Compromised.

Sat Mar 31, 2012 11:20 pm

Quoting HAWK21M (Reply 9):
Quoting fr8mech (Reply 7):
If the engineering department says it's ok, then it's ok

shouldn't it be approved by the Manufacturer & regulatory first

In order to be approved by engineering, it has to be approved by the regulator. This doesn't necessarily mean the regulator actually explicitly approved it though...many airlines have their own engineering capability and delegated authority to approve repairs. This is very similar to what the OEM's do...the regulators actually explicitly approve only a vanishingly small number of repairs. The regulators delegate their authority to qualified engineers at the OEM's, and some airlines if they can demonstrate the capability.

Tom.
 
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Sun Apr 01, 2012 2:35 am

Quoting tdscanuck (Reply 10):
The regulators delegate their authority to qualified engineers at the OEM's, and some airlines if they can demonstrate the capability.

Agreed.....But what explains the variation in the RVSM Area repairs.....Who is wrong.
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tdscanuck
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RE: Damage To Static Port Area - Rvsm Compromised.

Sun Apr 01, 2012 2:41 am

Quoting HAWK21M (Reply 11):
But what explains the variation in the RVSM Area repairs.....Who is wrong.

Possibly none of them...the ability to approve a repair is directly related to how well you know, exactly, what the actual requirements are and how your repair will impact them. That, in turn, depends on your engineering analysis capability and your access to the original requirements and specifications. The very same repair may be approvable by one organization and not approvable by another because one may have the ability and authority to show compliance and the other may not.

Tom.
 
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Wed Apr 04, 2012 8:30 pm

Quoting tdscanuck (Reply 12):
The very same repair may be approvable by one organization and not approvable by another because one may have the ability and authority to show compliance and the other may not.

Shouldn't an approved organisation for that task have the capability if approved.
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tdscanuck
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RE: Damage To Static Port Area - Rvsm Compromised.

Thu Apr 05, 2012 4:32 am

Quoting HAWK21M (Reply 13):
Quoting tdscanuck (Reply 12):
The very same repair may be approvable by one organization and not approvable by another because one may have the ability and authority to show compliance and the other may not.

Shouldn't an approved organisation for that task have the capability if approved.

Not really; any organization that's approved to certify their own repairs still needs to complete paperwork so say that they certify that the repair meets the FARs (or whatever the equivalent is in the relevant country). The trick is in being able to prove that you meet the FARs. A complex repair in a tricky area is difficult to analyze; a large MRO or airline with a very capable engineering group might be able to do very detailed analysis to show that the repair is good. A small operator, faced with the same repair, might not have the capability or know-how to show that the repair is good so, even though they're an approved organization, they may not be able to approve that particular repair.

A big kicker with repair design is knowing the loads; usually on the OEM knows that. That leaves 3rd parties with the task of proving that the repair is at least as strong as the original (hence must be strong enough for the loads)...that can be very easy or very difficult to do depending on the complexity of the repair.

Tom.
 
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HAWK21M
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RE: Damage To Static Port Area - Rvsm Compromised.

Mon Nov 25, 2013 12:02 pm

Quoting tdscanuck (Reply 14):
A big kicker with repair design is knowing the loads

That would need to be calculated theoritically........and approved by regulatory too right.
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