AD 79-18-05 ACTIVE

79-18-05 LITHIUM SULFUR DIOXIDE BATTERIES: Amendment 39-3549 as amended by Amendment 39-3708. Applies to all Lithium Sulfur Dioxide (LiSO2) batteries installed in aircraft or in equipment used in aircraft.

LiSO2 batteries have been used in, but not necessarily limited to, the following Emergency Locator Transmitters (ELT's):

Communications Components Corporation
Model CIR 10, all serial numbers Battery pack BP-60, BP-60A, BP-60B, and BP-60C.
Model CIR 11-2, all serial numbers Battery pack BP-60-11, BP-60-11A, BP-60-11B, and
BP-60-11C.

Cessna Aircraft Co.
Part Number C589511-0103
Part Number C589510-0202
Part Number C589510-0209
Part Number C589510-0109

Dorne and Margolin, Inc.
Model DMELT 6 serial numbers 1 to 24,999 with battery pack DMELT 6.11, except those ELT's which have been modified by the change to battery pack DMELT 6.13.

Garrett Manufacturing Ltd.
Model No. 627-810 - all serial numbers
627-818 - all serialnumbers
627-934 - all serial numbers
625-088 - all serial numbers

Battery part number
616-246-1
616-246-2

Leigh Systems, Inc.
Model SHARC 7 with a 3 or 4 cell battery pack. The ELT including battery weighs
approximately 1.8 pounds.

Pathfinder Corporation
Model No. 2052
Pointer Inc.

Model 2000
Model 2000, Series Mod A
Model 3000, Series Mod A
Model 3000-2
LiSO2 battery pack - P/N 2018, P2018, M2018, 2018 HSP, and 2018 HSM.

Other aircraft equipment that have used LiSO2 batteries:

(1) Bendix RNAV Computer Model RNS3500 Control Display Unit CD-3501A.

(2) Emergency lighting, sliderafts, and flashlights.
Manufacturer's have not used LiSO2 batteries in the following ELT's. However, such batteries may have been substituted after manufacture.

Pacific Communication Corporation
Alert Model 50, 60, and 70

Pacific Avionic Company, Inc.
Model ELT-1

DME Corporation
Model RLB-5 (A)Model RLB-9 (A) and (B)

Micro Electronics, Inc.

Emergency Beacon Corporation
All models

LARAGO/MERL, Inc.
LARAGO 79007
MERL 1005

Dorne and Margolin
Model DMELT 6 serial no. 25,000 and above

Compliance is required as indicated, unless already accomplished.

To prevent fire, venting violently, explosion, corrosion, or leakage of gas associated with certain LiSO2 batteries, accomplish the following:

(a) Before further flight, remove all LiSO2 batteries which do not meet the requirements of TSO-C97 from U.S.-registered civil aircraft, including any installed in equipment used in such aircraft.

NOTE: This AD requires that LiSO2 batteries used in U.S.-registered civil aircraft meet the requirements of TSO-C97. LiSO2 batteries removed from equipment in accordance with AD 79-05-02 or this AD may be replaced by LiSO2 batteries which meet the requirements of TSO-C97 or another power source. However, in either case the equipment must meet all applicable requirements of the Federal Aviation Regulations.

(b) Before further flight, remove from U.S.-registered civil aircraft any ELT powered by LiSO2 batteries which do not meet the requirements of TSO-C97, and comply with the recordkeeping and placarding requirements of FAR Section 91.52(f)(10)(i).

(c) For any aircraft from which an ELT has been removed to comply with AD 79-05-02 or this AD, before March 28, 1980 (October 15, 1980 for ELT's specified in paragraph (f) of the AD) either -

(1) Install LiSO2 batteries which meet the requirements of TSO-C97 in the ELT and, provided the ELT meets the requirements of FAR Section 37.200, reinstall it in the aircraft; or

(2) Install in the aircraft an ELT which meets the requirements of FAR Section 37.200 which is powered by a source other than LiSO2 batteries.

(d) Upon installation of an ELT in accordance with paragraph (c) of this AD, record in the aircraft records the action taken, and remove the placard which states "ELT NOT INSTALLED."

(e) Notwithstanding FAR Section 91.52(f)(10)(ii), an aircraft from which an ELT has been removed in accordance with AD 79-05-02 or this AD, may operate without an ELT required by FAR Sections 91.52(a) and (b) until complying with paragraph (c) of this AD, but in no event later than March 28, 1980 (October 15, 1980 for ELT's specified in paragraph (f) of this AD).

(f) The later alternate compliance date specified in paragraphs (c) and (e) of this AD applies when a removed ELT was manufactured by:

(1) Communications Components Corporation

(2) Garrett Manufacturing Ltd; and

(3) Leigh Systems, Inc.

Amendment 39-3549 superseded Amendment 39-3422, AD 79-05-02.

Amendment 39-3549 became effective August 24, 1979.

This Amendment 39-3708 becomes effective February 28, 1980.