GOVERNMENT OF INDIA CIVIL AVIATION REQUIREMENTS
CIVIL AVIATION DEPARTMENT SECTION 2 - AIRWORTHINESS
SERIES 'X' PART V
ISSUE II, DATED 15TH APRIL '1977
File No. 9/497/76-AI(2) EFFECTIVE : FORTHWITH
Subject : Concessions.
1. BACKGROUND :
An operator or overhauling/repair organisation is sometimes
faced with a problem of procuring replacement
parts/materials, meeting specifications stipulated in
approved type design documents or of effecting major
repairs/major modifications in the manner as approved by the
manufacturers, in respect of aircraft/aircraft
component/item of equipment. Under such circumstances
marginal deviations from approved specifications not
affecting the safety of aircraft may be approved by DGCA.
This may be covered by the grant of a "concession".
2. DEFINITIONS :
(a) "Concession" is defined as permission by the DGCA to
use a limited quantity of material/parts not
manufactured exactly in accordance with the
manufacturer's approved design specifications or to
effect major modification/repair not completely in
conformity with that approved by manufacturers, but
are acceptable to DGCA, keeping the safety of aircraft
in view.
(b) "Major Modifications" are those alterations to the
primary structure/parts/equipment/systems that are
likely to jeopardise the safety of aircraft and those
on board if not carried out at all or if carried out
improperly and affect its weight, centre of gravity,
structural integrity or cause change in design or
material or flight characteristics.
(c) "Major Repair" is a repair, which if not or improperly
(using unapproved procedures/methods) accomplished,
would adversely affect the aircraft structural
strength, performance, flight characteristics and
consequently its safety as well as the safety of those
on board.
3. SCOPE :
(i) Aircraft operators or overhauling/repair organizations
finding difficulty in procuring approved replacement
material/parts, may approach Regional Airworthiness
Office with a request furnishing details (in
triplicate) as listed in the appendix to this part of
the CAR for using substitute material/parts in the
assembly of aircraft, aircraft components, equipment
and systems, provided such substitutes are procured
from sources acceptable to DGCA and are able to meet
type specification requirements.
(ii) Requests for grant of "Concessions" relating to use of
material/parts in, or effecting minor modifications or
carrying out minor repairs to aircraft secondary (not
primary) structure, aircraft systems other than primary
systems like flight control system, landing gear
system, pressurization system, navigational system,
Auto flight, Electrical Power Generation and
Distribution, Fire Extinguishing, Hydraulic Power,
engine control system, fuel system, emergency
evacuation system etc., will be disposed of by the
Regional Airworthiness Offices. However, such approved
firms, whose scope of approval specifically includes
such delegation may use substitute material/parts in
aircraft systems other than those mentioned in this
para, under the authority of Quality Control Manager
provided proper records are maintained and Regional
Airworthiness Offices are informed of such actions,
soon after accomplishment of work.
(iii)Requests for grant of "Concessions" relating to use of
material/parts or effecting major modification or
carrying out major repairs to aircraft primary
structure or to aircraft systems mentioned in para (ii)
above must be referred to DGCA, via Regional
Airworthiness Offices for prior approval.
4. Repairs, major or minor, carried out strictly in conformity
with the standard aeronautical practice, spelt out in well
recognised documents, like Federal Aviation Administration -
'Aircraft Inspection and Repair - AC 43.13 Manual' of USA
and 'Civil Aircraft Inspection Procedures' of Civil Aviation
Authority of UK need not have prior approval of DGCA.
5. The approval will be indicated on the format (appendix)
itself, one copy of which will be returned to the
applicant. Such approved formats shall be carefully
preserved by the applicant for future reference for as long
a period as the log books are kept.
6. Whenever such materials/parts (covered under Concession) are
used, the related documents like log books, procedure sheets
etc., must make a mention of the same.
Sd/-
(V. N. Kapur)
Director of Airworthiness
for Director General of Civil Aviation
A P P E N D I X
C O N C E S S I O N F O R M
Station Applicant's reference/Drg.
Concession No.
Date of Application :
Application made by
A concession is hereby requested
to (quote job and/or process).
Reason for requesting Concession.
Aircraft registration or Serial No.
of Engine accessories to which
concession applies.
Quantity of Parts to be covered
by this Concession :
Part No. of the item(s) involved
and details of similar concession
granted earlier (if any).
List relevant deviations from
type specifications, such as material
composition/gauge/strength, dimensions,
process, operating limitations etc.
Person responsible for certification
of Job :
Drawings attached No.
Signature of applicant.
Designation:
The above Concession is/not granted to
Subject to
Concession No. allotted
Date Signature
Station Designation :
- END -