Avionics News October 2015 - 15

on "Records of overhaul and rebuilding,"
presently reads, in pertinent part:
(a) No person may describe in any
required maintenance entry or form
an aircraft, airframe, aircraft engine,
propeller, appliance, or component part
as being overhauled unless -
(1) Using methods, techniques, and
practices acceptable to the administrator,
it has been disassembled, cleaned,
inspected, repaired as necessary, and
reassembled; and
(2) It has been tested in accordance with
approved standards and technical data,
or in accordance with current standards
and technical data acceptable to the
administrator.
Your concern was directed to the interpretation
of the term overhaul as it applies to items or
parts that are incapable of nondestructive
disassembly. You noted, as examples, parts
such as spacers, blades, vanes, cases, and
shafts, which typically undergo cleaning,
inspecting, repairing, and testing during their
overhaul. Such parts also typically undergo
those processes during the overhaul of larger
products of which they are components.
Your letter also points out that the Preamble to
the rule (47 FR 41076, Sept. 16, 1982) included
a paragraph that provides guidance useful in
interpreting the section. That paragraph stated:
Several commenters state the term "completely
disassembled" is inappropriate because in
numerous instances "complete" disassembly
would damage the product beyond further
service. The word "complete" is deleted.
However, it is intended that disassembly should
be to the extent required to make a complete
determination of conformity with the product's
original qualities.
We agree that the quoted language from the
Preamble aids in interpreting the regulation.
Both logic and the Preamble's language compel
the conclusion that complete disassembly and
reassembly of certain parts are not necessary
if, in their normal state, they can be examined

to determine with certainty their conformity
with their original qualities. Indeed, while you
observed that one could theoretically further
disassemble such parts (e.g., by cutting the
material), such analysis would actually damage
the part. A part need not be disassembled to
this extent to be eligible for a determination
that it has been overhauled if it has been
subjected to inspections, examinations, or
tests capable of accurately determining its
airworthiness.
2. When a part, component, or subassembly
of a product has been disassembled (to the
extent contemplated by the above Preamble
language), cleaned, inspected, repaired, and
tested in accordance with standards or data
approved by or acceptable to the administrator,
it may be deemed overhauled within the context
of FAR section 43.2. Consequently, a part,
component, or subassembly of that larger
assembly or product should also be deemed
overhauled if it can be shown to be airworthy
by inspection, examination, or tests that do not
require disassembly beyond its normal state.
Indeed, such disassembly would, in effect,
destroy the part.
Accordingly, it is our opinion that the
interpretation of the word "overhaul" advanced
by the Windsor Locks Flight Standards District
Office in its March 25, 1991, letter is too
narrow in the context of the above-mentioned
circumstances.
It is also our opinion that any part that is
deemed overhauled within the meaning of FAR
section 43.2, also meets the intent of the term
"newly overhauled" as that term is used in
FAR section 21.331(a)(1), with respect to the
issuance of airworthiness approval tags for
Class II products.
I hope this response has addressed your
concerns and that it is helpful to you.
Donald P. Byrne
Assistant Chief Counsel
Regulations and Enforcement Division
Continued on following page

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Table of Contents for the Digital Edition of Avionics News October 2015

Avionics News October 2015 - Intro
Avionics News October 2015 - Cover1
Avionics News October 2015 - Cover2
Avionics News October 2015 - 1
Avionics News October 2015 - 2
Avionics News October 2015 - 3
Avionics News October 2015 - 4
Avionics News October 2015 - 5
Avionics News October 2015 - 6
Avionics News October 2015 - 7
Avionics News October 2015 - 8
Avionics News October 2015 - 9
Avionics News October 2015 - 10
Avionics News October 2015 - 11
Avionics News October 2015 - 12
Avionics News October 2015 - 13
Avionics News October 2015 - 14
Avionics News October 2015 - 15
Avionics News October 2015 - 16
Avionics News October 2015 - 17
Avionics News October 2015 - 18
Avionics News October 2015 - 19
Avionics News October 2015 - 20
Avionics News October 2015 - 21
Avionics News October 2015 - 22
Avionics News October 2015 - 23
Avionics News October 2015 - 24
Avionics News October 2015 - 25
Avionics News October 2015 - 26
Avionics News October 2015 - 27
Avionics News October 2015 - 28
Avionics News October 2015 - 29
Avionics News October 2015 - 30
Avionics News October 2015 - 31
Avionics News October 2015 - 32
Avionics News October 2015 - 33
Avionics News October 2015 - 34
Avionics News October 2015 - 35
Avionics News October 2015 - 36
Avionics News October 2015 - 37
Avionics News October 2015 - 38
Avionics News October 2015 - 39
Avionics News October 2015 - 40
Avionics News October 2015 - 41
Avionics News October 2015 - 42
Avionics News October 2015 - 43
Avionics News October 2015 - 44
Avionics News October 2015 - 45
Avionics News October 2015 - 46
Avionics News October 2015 - 47
Avionics News October 2015 - 48
Avionics News October 2015 - 49
Avionics News October 2015 - 50
Avionics News October 2015 - 51
Avionics News October 2015 - 52
Avionics News October 2015 - 53
Avionics News October 2015 - 54
Avionics News October 2015 - 55
Avionics News October 2015 - 56
Avionics News October 2015 - 57
Avionics News October 2015 - 58
Avionics News October 2015 - 59
Avionics News October 2015 - 60
Avionics News October 2015 - 61
Avionics News October 2015 - 62
Avionics News October 2015 - 63
Avionics News October 2015 - 64
Avionics News October 2015 - 65
Avionics News October 2015 - 66
Avionics News October 2015 - 67
Avionics News October 2015 - 68
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Avionics News October 2015 - 70
Avionics News October 2015 - 71
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Avionics News October 2015 - 80
Avionics News October 2015 - Cover3
Avionics News October 2015 - Cover4
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