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Static Pressure Port Research Help Requested  
User currently offlineAeroTechnical From Australia, joined Jan 2008, 4 posts, RR: 0
Posted (6 years 8 months 2 weeks 3 days 11 hours ago) and read 4525 times:

G-Day all, (first post, go easy)

I am researching procedures/products employed across all Aircraft types for "static pressure port covering" (flush mounted not pitot-static), required for the purpose of aircraft Washing, Painting, storage and cleaning. Information help required to aid development of a new "static pressure port cover" to increase flight safety around critical pressure sensors during the above maintenance practices.

My reason for researching, the simply practice of applying let's say tape over static ports for a maintenance procedure is at best a very simple process, although at my place of work it's been done incorrectly for the past 15+ years, after I read the procedure & asked a few Q's it became quite clear we are simply doing it illegally.

Information requested;
1.Approved maintenance procedures
2.Approved tapes, covers and barrier materials used
3.Quantity of static ports per A/C type
4.Picture of port types (within red boarder)
5.Measurements, diameter of port containing multiple sensing holes, diameter of non-painted area around static port and distance between centre of multiple static ports clustered together.
6.Stories of close calls, illegal practices or what shouldn't happen at your work.

Please forward supporting information to my "contact" email tas6@optusnet.com.au , as the volume could be far too much for this site?

I understand this is a huge task and will take some time; your time & efforts on an international scale will be most appreciated

Aero Technical

14 replies: All unread, jump to last
 
User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 1, posted (6 years 8 months 2 weeks 2 days 16 hours ago) and read 4473 times:



Quoting AeroTechnical (Thread starter):
Information requested;
1.Approved maintenance procedures
2.Approved tapes, covers and barrier materials used
3.Quantity of static ports per A/C type
4.Picture of port types (within red boarder)
5.Measurements, diameter of port containing multiple sensing holes, diameter of non-painted area around static port and distance between centre of multiple static ports clustered together.

All of this information will be contained in the Aircraft Maintenance Manual. Since you're profile lists you as an AME, I suspect you should have access to these. Check out chapter 34 for the static port locations and chapter 10 for the washing procedures, including approved cover materials. For the paint layout, see chapter 51 of the Structural Repair Manual.

Quoting AeroTechnical (Thread starter):
6.Stories of close calls, illegal practices or what shouldn't happen at your work.

Cannonical case: http://en.wikipedia.org/wiki/Aeroper%C3%BA_Flight_603

Tom.


User currently offlineAeroTechnical From Australia, joined Jan 2008, 4 posts, RR: 0
Reply 2, posted (6 years 8 months 2 weeks 1 hour ago) and read 4434 times:

Tom et all,

Quoting: tdscanuck, All of this information will be contained in the Aircraft Maintenance Manual. Since you're profile lists you as an AME, I suspect you should have access to these. Check out chapter 34 for the static port locations and chapter 10 for the washing procedures, including approved cover materials. For the paint layout, see chapter 51 of the Structural Repair Manual.

my aviation experience is all Military, access to domestic aviation information / procedures are not available and the main reason for the post.
Flight_603 was the reason I looked at our procedure, please don't just read, send a copy of yours & possibly prevent this reoccurring?

Aero Technical


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 3, posted (6 years 8 months 1 week 6 days 19 hours ago) and read 4416 times:



Quoting AeroTechnical (Reply 2):
my aviation experience is all Military, access to domestic aviation information / procedures are not available and the main reason for the post.
Flight_603 was the reason I looked at our procedure, please don't just read, send a copy of yours & possibly prevent this reoccurring?

Unfortunately, those documents aren't mine to distribute. I would discuss with your closest airline, or someone else who does have the authority to distribute them. In the interim, study up on the manuals you do have (they should address this for military as well, I would hope) and read as much of the accident data for Flight 603 as you can find.

Tom.


User currently offlineBWilliams From United States of America, joined Sep 2007, 212 posts, RR: 0
Reply 4, posted (6 years 8 months 1 week 6 days 19 hours ago) and read 4415 times:



Quoting Tdscanuck (Reply 3):
Unfortunately, those documents aren't mine to distribute. I would discuss with your closest airline, or someone else who does have the authority to distribute them.

Just a question that i've wondered: why is it that mechanics reference chapters of the AMM in different thread, but never actually say anything about what those chapters contain (other then a chapter title or the like), and in this case, can't distribute them? Do you have to be a licensed A&P to get a copy of the AMM/SRM?



Regards, Brad Williams
User currently offlineFr8mech From United States of America, joined Sep 2005, 5452 posts, RR: 14
Reply 5, posted (6 years 8 months 1 week 6 days 19 hours ago) and read 4413 times:



Quoting BWilliams (Reply 4):
Just a question that i've wondered: why is it that mechanics reference chapters of the AMM in different thread, but never actually say anything about what those chapters contain (other then a chapter title or the like), and in this case, can't distribute them? Do you have to be a licensed A&P to get a copy of the AMM/SRM?

No, you don't have to be a licensed AMT to get a copy of the AMM or SRM. Though these manuals are distributed by the manufacturers, they are revised by the operator, with concurrance from the manufacturer. This stuff is rarely confidential, but most employees sign non-disclosure agreements when they hire on. This agreement usually prohibits the distribution of company material without permission. Everyone of our manuals has the "This is the property of ..." clause on the very first pages.



When seconds count...the police are minutes away.
User currently offlineMD11Engineer From Germany, joined Oct 2003, 14026 posts, RR: 62
Reply 6, posted (6 years 8 months 1 week 6 days 18 hours ago) and read 4409 times:

Ok, according to our company procedure, the cleaners notify us that they need to do an external wash on aircraft XYZ. We cover the static ports using a bright red self-adhesive plasic tape, to which we attach long flags (appr. 1 metre) of red and white danger tape. Additionally a laminated card stating "CAUTION! STATIC PORTS COVERED!" will be attached to the captain's teering wheel. Then a tech log entry stating that the static ports have been coverted is made.
When the cleaners tell us that they are finished we remove the covering tape and carry out a duplicate inspection for the removal of the covers and close the tech log entry. The cleaners note the tech log page number on their cleaning sheet, which has to be signed by the captain in the morning.

Jan


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 7, posted (6 years 8 months 1 week 6 days 17 hours ago) and read 4391 times:



Quoting BWilliams (Reply 4):
Just a question that i've wondered: why is it that mechanics reference chapters of the AMM in different thread, but never actually say anything about what those chapters contain (other then a chapter title or the like), and in this case, can't distribute them?

As Ff8Mech said, most people with access to the manuals are also under a non-disclosure agreement or other document that prevents them from distributing them to people that don't have access (usually, anyone outside the company). There's no A&P requirement, you just have to work for someone that has them. In my case, I can access all the Boeing manuals but the same contract that lets me do that also prohibits me from distributing the documents.

References to just chapter numbers work because the chapter numbers are standard across all manufacturers (they're set by the ATA). Also, any particular task is so long and tedious that reposting it in its entirety would just waste bandwidth...it's a lot easier to just reference the right chunk of the manual

If you want to know what a particular manual says, I'd be happy to dig that up, but doing it for all the manuals I have access to is long, tedious, and not particularly productive since they all say pretty much the same thing.

Tom.


User currently offlineMD11Engineer From Germany, joined Oct 2003, 14026 posts, RR: 62
Reply 8, posted (6 years 8 months 1 week 6 days 16 hours ago) and read 4390 times:

The aircraft manufacturers, who write the manuals, consider the content proprietary material and don't like it distributed without their permission. Actually, to buy these manuals from e.g. Boeing, you'll need to be the owner of an aircraft.

Jan


User currently offlineAeroTechnical From Australia, joined Jan 2008, 4 posts, RR: 0
Reply 9, posted (6 years 8 months 1 week 6 days ago) and read 4358 times:

Totally understand the legalities of documentation control, don't require electronic 100% certified copies of your publication, as per below is an example of what I am looking for.

"Seal by placing barrier paper MIL-B-121 or equivalent over static port. Seal edges with pressure sensitive tapes"

"Apply colour contrasting waterproof tape to static vents"

"Waterproof tape and barrier material containing PVC plastic must not be used"

"Static vents shall be sealed using 1 inch wide red coloured PVC tape only, 24 inch long streamers shall be left at each point, the use of clear tape is not permitted"

As you can read some methods contradict others (PVC), my understanding is masking or pressure sensitive tape is not to be directly applied to the static ports and a barrier material used over the holes?

Quote: MD11engineer, "We cover the static ports using a bright red self-adhesive plastic tape"


Aero Technical


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 10, posted (6 years 8 months 1 week 5 days 13 hours ago) and read 4334 times:



Quoting AeroTechnical (Reply 9):
Totally understand the legalities of documentation control, don't require electronic 100% certified copies of your publication,

Gotcha. Also, I realized I did a typo in Reply 1...the washing procedures are in Chapter 12, not 10. 10 is parking & mooring.

For a 737, the static port procedures are:
-Clean around each port with solvent and dry rag
-Place the end of a long (~4 feet) strip of barricade tape over the static port
-Tape the end barricade tape in place with Scotch or 3M #471 yellow vinyl tape (never put the Scotch tape directly over the static port holes)
-Tape edges of the barricade tape on each side of the static port with Scotch tape
-Tape across the barricade tape below the static ports, overlaping the edge tape
-Leave the tail of the barricade tape streaming as a visual indicator
-Wire a "Static ports covered" placard to the top of the left yoke
-When you're done, remove the tape and barricade tape, clean up any tape residue with solvent, and remove the placard (last)

"Barricade tape" is Boeing-speak for orange 3 inch "REMOVE BEFORE FLIGHT" tape.

Hope that's helpful,
Tom.


User currently offline737tdi From United States of America, joined Sep 2007, 843 posts, RR: 1
Reply 11, posted (6 years 8 months 1 week 5 days 13 hours ago) and read 4331 times:
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Tdscanuck/Tom hit it right on the nose for us. The main point being is you do not apply the tape directly to the port due to adhesive residue being left in the sense holes.

737tdi


User currently offlineAeroTechnical From Australia, joined Jan 2008, 4 posts, RR: 0
Reply 12, posted (6 years 8 months 1 week 5 days 6 hours ago) and read 4318 times:

Cool, now were on the same page, as it is we carry the 3M-471 but for another job,

Q, what solvent is used to clean area?,
Q, could you please measure the diameter across the static port holes as if you draw a circle around each port group and the distance from ctr to ctr separating each static port if a few within the cluster.

Trying to make this cover as universal as possible, the more A/C types the better, THANKS

Aero Technical


User currently offlineTdscanuck From Canada, joined Jan 2006, 12709 posts, RR: 79
Reply 13, posted (6 years 8 months 1 week 4 days 18 hours ago) and read 4301 times:



Quoting AeroTechnical (Reply 12):
Q, what solvent is used to clean area?,

Aliphatic naphtha

Quoting AeroTechnical (Reply 12):
Q, could you please measure the diameter across the static port holes as if you draw a circle around each port group and the distance from ctr to ctr separating each static port if a few within the cluster.

Eyeballing it from the manual, on a 737 it appears to be a 3 inch circle of bare material around each port, and 3 inches between ports where you have clusters. However, that probably varies from airplane to airplane.

Tom.


User currently offlineMD11Engineer From Germany, joined Oct 2003, 14026 posts, RR: 62
Reply 14, posted (6 years 8 months 1 week 4 days 17 hours ago) and read 4292 times:



Quoting 737tdi (Reply 11):
Tdscanuck/Tom hit it right on the nose for us. The main point being is you do not apply the tape directly to the port due to adhesive residue being left in the sense holes.

737tdi

Actually the same way we do it, I should have explained it in more detail.

Jan


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