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static check

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Mon Sep 12, 2011 3:36 am Post subject: static check

9/12/2011



Hello Corky, Now you have asked a new question and it has two parts to it.



1) The first part of your question is: "...can i as IA PERFORM STATIC

CHECKS......"



The answer to that part of the question is YES, and the details of that YES

answer are found in my previously posted answer of Sun, Sep 11, 2011 at 9:43

AM.



2) The second part of your question is: ".... can i as IA PERFORM ALTIMETER

CERTS."



By "ALTIMETER CERTS" I believe that you must be referring to ALL of the

tests required by 14 CFR 91.411 (a). ALL of those required tests (with the

exception of the static pressure system tests and inspections) must be

conducted by the one of the organizations listed in 91.411 (b). See here:



"(b) The tests required by paragraph (a) of this section must be conducted

by-

(1) The manufacturer** of the airplane, or helicopter, on which the tests

and inspections are to be performed;

(2) A certificated repair station properly equipped to perform those

functions and holding-

(i) An instrument rating, Class I;

(ii) A limited instrument rating appropriate to the make and model of

appliance to be tested;

(iii) A limited rating appropriate to the test to be performed;

(iv) An airframe rating appropriate to the airplane, or helicopter, to be

tested;"



Since a normal A&P Mechanic, even one possessing IA (Inspection Authority),

does not meet any one of the qualifications listed above then he CAN NOT

PERFORM all of the 91.411 (a) required tests on either type certificated or

experimental amateur built aircraft.##



Please let me know if you have any further questions.



'OC' Baker Says: "The best investment we can make is the time and effort to

gather and understand knowledge."



**PS: Every once in a while the builder of an experimental amateur built

aircraft decides that he is the "manufacturer" of that aircraft and

therefore under paragraph 91.411 (b) (1) is permitted to perform the tests

required by 91.411 (a). That is not correct -- he is not considered the

"manufacturer" of his experimental amateur built aircraft by the FAA.

##PS: It is very unfortunate that the tests required every two years by 14

CFR 91.411 and 91.413 are routinely referred to as ".... pitot static system

checks ...". That is a very misleading and confusing term for the tests that

are required.



================================================================

From: "corky childs" <corkyabc(at)charter.net>

To: <bakerocb(at)cox.net>

Sent: Sunday, September 11, 2011 5:12 PM

Subject: Re: static check

my question is can i as IA PERFORM STATIC CHECKS AND PERFORM ALTIMETER

CERTS

==================================================================

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bakerocb

Joined: 15 Jan 2006
Posts: 727
Location: FAIRFAX VA

Posted: Mon Sep 12, 2011 3:41 am Post subject: static check

9/11/2011



Hello Corky, I'd like to respond by cutting and pasting a previous posting

of mine. Let's start with a look at 14 CFR 91.411:

"91.411   Altimeter system and altitude reporting equipment tests and

inspections.



(a) No person may operate an airplane, or helicopter, in controlled airspace

under IFR unless-**



(2) Except for the use of system drain and alternate static pressure valves,

following any opening and closing of the static pressure system, that system

has been tested and inspected and found to comply with paragraph (a),

appendix E, of part 43 of this chapter; and....."



"(b) The tests required by paragraph (a) of this section must be conducted

by-



{several different qualification requirements listed including:}



(3) A certificated mechanic with an airframe rating (static pressure system

tests and inspections only)."##



Being a certificated A&P mechanic I turned to Appendix E, of part 43 which

reads in part:



"Appendix E to Part 43-Altimeter System Test and Inspection



Each person performing the altimeter system tests and inspections required

by §91.411 shall comply with the following:



(a) Static pressure system:



(2) Determine that leakage is within the tolerances established in §23.1325

or §25.1325, whichever is applicable."



So I then needed to go on to PART 23--AIRWORTHINESS STANDARDS: NORMAL,

UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES to find out how to

perform the test and what the leakage tolerances were.



Here is what 23.1325 says in part:



"23.1325   Static pressure system.



(b) If a static pressure system is necessary for the functioning of

instruments, systems, or devices, it must comply with the provisions of

paragraphs (b)(1) through (3) of this section.



(2) A proof test must be conducted to demonstrate the integrity of the

static pressure system in the following manner:



(i) Unpressurized airplanes. Evacuate the static pressure system to a

pressure differential of approximately 1 inch of mercury or to a reading on

the altimeter, 1,000 feet above the aircraft elevation at the time of the

test. Without additional pumping for a period of 1 minute, the loss of

indicated altitude must not exceed 100 feet on the altimeter."



So how to evacuate the static pressure system? After plugging up the two

static ports I opened the system drain connection in my static system and

plumbed in this MixMizer syringe:



http://www.hopkinsmfg.com/10111.html



This device readily evacuated the system and the static system passed the

leak test. After closing up the system drain connection and making the

required log book entry I was good to go.



What did we learn from this exercise?



A) For some mandatory regulatory requirements there are some provisions of

14 CFR that do apply to our experimental amateur built aircraft even if at

first glance some of them (Part 43 and Part 23 for example) do not appear to

apply.



B) Even though anyone can work on, repair, modify, inspect, and maintain an

amateur built experimental aircraft there are certain items that require

action by specially qualified individuals. The annual condition inspection

is one item requiring performance by either the holder of the Repairman

Certificate for that specific aircraft or the holder of an A&P certificate.

Another is the requirement for either the holder of an Airframe certificate

or one of the other entities identified in 91.411 (b) in order to conduct a

regulatory acceptable static system check.



Please let me know if you have any further questions. Thanks,



'OC' Says: "The best investment we can make is the effort to gather and

understand knowledge."



**PS: Note that while this section pertains to "..operate (ing) ... in

controlled airspace under IFR ...." a careful reading of the FAR's (see

sections 91.215 and 91.413) will show that a VFR only airplane with an

integrated altitude encoder and transponder system (which is just about

everyone) will also require a static system check under certain

circumstances.



##PS: Note that being the builder and designated repairman for this specific

experimental amateur built airplane did not qualify me to perform the static

system test and inspection.



=====================================================

From: corky childs

To: bakerocb(at)cox.net

Sent: Saturday, September 10, 2011 4:09 PM

Subject: static check

if i had a ap and ia what else would i need to static test experminital anc

certified aircraft thanks corky

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