VOLUME 3 GENERAL TECHNICAL ADMINISTRATION
CHAPTER 39 APPROVE PARTS/PARTS POOL/PARTS BORROWING
Section 1 Safety Assurance System: Evaluate and Approve Aircraft Parts, Parts Pool, and Parts Borrowing Authorization
3-3756 REPORTING SYSTEM(S). Use Safety Assurance System (SAS) automation.
This section is related to SAS Element 4.7.2 (AW), Aircraft Parts/Material Control.
3-3757 OBJECTIVE. This chapter provides guidance in evaluating and approving aircraft parts, a Title 14 of
the Code of Federal Regulations (14 CFR) part
pool, and a 14 CFR parts
or more) parts borrowing authorization.
1) Articles. Materials, parts, or appliances.
2) Operator-Manufactured Parts. Parts manufactured and documented by the operator for use only on that
operator’s aircraft. The parts must comply with the original type design and cannot be part of a pool or borrowing agreement.
3) Parts. Any engine, propeller, component, accessory, material, or hardware used on an air carrier aircraft.
4) Parts Manufacturer Approval (PMA). PMA parts are parts produced by manufacturers other than the type
certificate holder (TCH). These parts must be identical to parts covered under a type certificate (TC), and they must be marked as such. Federal
Aviation Administration (FAA) manufacturing inspectors or a manufacturer with PMA authority may approve these parts for use.
5) Supplemental Type Certificate (STC). When a major change in type design does not require a new application
for a TC, an STC is issued. Parts manufactured under an STC are approved under the STC.
6) Technical Standard Order (TSO). A TSO is a minimum performance standard for specified articles used on
civil aircraft and is issued by FAA Engineering. These articles may be used on a variety of equipment items.
7) Type Certificate (TC). As defined by 14 CFR part
a TC includes the type design, operating limitations, Type Certificate Data Sheet (TCDS), applicable regulations, and any other conditions or
limitations prescribed by the Administrator.
B. Certification Standards. An operator must ensure that all replacement parts meet or exceed original
certification standards. Standard hardware and materials can be used and exchanged without special procedures. When special requirements must be
met, accurate documentation must be maintained. Purchase, use, and exchange of parts require special procedures that must be part of the
operator’s manual, and in certain circumstances, part of the operator’s operations specifications (OpSpecs).
3-3759 PARTS POOL AGREEMENT AUTHORIZATION. These authorizations apply only to part
operating outside the United States.
A. When Operating Under This Authorization. All other provisions for part
applicable. In addition, part
surveillance of the foreign facilities and their procedures to ensure that all work on pooled parts is performed according to the operator’s
B. These Authorizations are Approved by Issuance of OpSpecs. The OpSpecs are required only to list those
participants (and their locations) inspected by the operator and acceptable to the FAA.
1) In instances where several U.S.-certificated operators use a foreign facility, the FAA does not object to a
participating operator accepting another participating operator’s initial or biennial inspection report, provided the operator’s manual reflects
deviation allowing the return to service and use of airframe components, powerplants, appliances, and spare parts thereof that have been
maintained, altered, or inspected by persons employed outside the United States who do not hold U.S. Airman Certificates. The operator’s OpSpecs
authorize this deviation.
C. Foreign Facility Inspections.The operator must have in its manual procedures to inspect the parts pooling
facilities. The manual also must include procedures to ensure the maintenance of parts according to the operator’s maintenance manuals.
3-3760 PARTS BORROWING AUTHORIZATION.
A. Time Limits. A certificate holder operating under part
121 or part
be issued OpSpecs to allow it to borrow a part with a higher time since overhaul than authorized, subject to certain conditions and
limitations. Since no regulations govern this activity, the OpSpecs must specify that the operator can borrow a part from another operator when
the time in service of the available part exceeds the operator’s approved overhaul time limit. The parts, however, cannot exceed the lender’s
approved time limits.
B. Landing Limits. If the number of landings controls the part’s service or overhaul time limit, an operator
may borrow and use a part for a maximum of 100 hours or 50 landings when the time in service of the part exceeds the borrower’s approved time
limits. The following limitations must be met:
1) The part must have a minimum of 200 hours or 100 landings (if approved time is controlled by landings)
remaining before service or overhaul in the lender’s program.
2) The part may not be operated beyond its approved life limit.
3-3761 PARTS APPROVAL.
A. Questionable Parts. Under present regulations, the FAA does not have the authority to prevent the sale or
use of aircraft parts of questionable serviceability. Although it is the operator’s responsibility to be aware of the possible consequences of
using questionable parts on certificated aircraft, the inspector should offer guidance to help prevent possible problems. An operator using a
part of unknown quality, condition, or origin must be able to prove conclusively that such parts conform to the provisions of 14 CFR part
B. Proper Maintenance. The operator is responsible for maintaining parts in a condition that ensures the parts
continue to meet the original type design. Procedures to ensure this proper maintenance must be part of the operator’s manual.
C. FAA Approval System. The FAA has a parts manufacturing approval system in effect that allows the FAA to
control the sale of reproduction parts. Parts manufactured under this system must display evidence of FAA approval, verifying the origin and
D. Manufacturing Replacement Parts. Repair stations or air carriers may manufacture replacement parts as part
of their maintenance program. These parts are acceptable, provided they are manufactured according to acceptable FAA-approved data.
E. Replacements from Other Aircraft. Parts, appliances, and components from aircraft that have been involved
in accidents or crashes are available to the industry as replacements. Section
43.13 requires that serviceability be
ensured before use.
F. Ex-Military Aircraft. Ex-military aircraft now under civilian TCs create parts problems, particularly when
the original manufacturer has ceased production. Certain parts of original manufacture are available for a given aircraft for a number of years
after its departure from military status. If original manufacturer fabrication can be substantiated for such parts, they are acceptable, provided
they comply with all applicable Airworthiness Directives (AD).
G. Illegal Parts. Certain parts for ex-military or currently manufactured aircraft are, and have been, scarce.
Occasionally, parties other than the original or approved manufacturer produce these parts illegally and offer them for sale. These illegal
parts constitute a hazard to flight safety.
H. Imported Parts. Parts manufactured in foreign countries and supplied to U.S.-certificated operators for use
on their aircraft must be imported according to §
3-3762 COORDINATION REQUIREMENTS. This task requires coordination between the involved Airworthiness inspectors
and the operator. Regional coordination may be necessary.
3-3763 REFERENCES, FORMS, AND JOB AIDS.
A. References (current editions):
· Title 14 CFR Part
· Title 14 CFR Part
· Title 14 CFR Part
· Title 14 CFR Part
· Advisory Circular (AC)
Eligibility, Quality, and Identification of Aeronautical Replacement Parts.
Acceptable Methods, Techniques, and PracticesAircraft Inspection and Repair.
B. Forms. None.
C. Job Aids. Automated OpSpecs checklists and worksheets.
A. Review Operator’s Manual for Parts Pool Authorization. Ensure the manual includes:
1) Procedures to ensure qualified personnel of the operator’s organization perform an initial inspection of the
involved foreign facilities. This inspection should ensure that facilities meet the certificate holder’s manual requirements, have properly
qualified and trained personnel, and can furnish the parts intended.
2) Procedures to provide for biennial inspections of the foreign facilities to ensure continued conformity
to the operator’s manual in supplying the required parts.
3) Inclusion of, or reference to, the foreign facilities’ maintenance programs in the operator’s manual, if
B. Review Operator’s Manual for Parts Borrowing Authorization Procedures.
1) Ensure the manual includes the following procedures:
a) Procedures that restrict the overhaul time limits to those authorized by OpSpecs.
b) Procedures that restrict a remaining minimum time to overhaul to that authorized by OpSpecs.
2) Ensure the operator has an approved list of authorized vendors, repair stations, and air carriers from
which it may borrow parts.
3-3765 TASK OUTCOMES.
A. Follow the SAS Process to Record This Activity.
B. Complete the Task. Successful completion of this task will result in issuance of the following OpSpecs:
· OpSpec D081, Parts Pool Agreement Authorization.
· OpSpec D083, Short-Term Escalation Authorization for
Borrowed Parts Subject to Overhaul Requirements.
C. Analyze Results. Follow SAS guidance for Module 5.
3-3766 FUTURE ACTIVITIES. Follow SAS guidance.
RESERVED. Paragraphs 3-3767 through 3-3780.