AD 78-05-08 R3

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AD Number:
78-05-08 R3
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
BOEING Model 747 Series Airplanes
Subject:
Cool Gas Generators
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
02/09/1981
Make:
The Boeing Company
Model:
747-100 Series | 747-100B Series | 747-100B SUD Series | 747-200B Series | 747-200C Series | 747-200...Show more
Product Type:
Aircraft
Product Subtype:
Large Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 78-05-08 R3
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-4030

AD NUMBER:   78-05-08 R3

SUBJECT HEADING:   BOEING Model 747 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective February 9, 1981.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
78-05-08 R3 BOEING: Amendment 39-3155 as amended by Amendment 39-3458 and Amendment 39- 3887 is further amended by Amendment 39-4030. Applies to all Boeing 747 series airplanes which incorporate propellant cartridges manufactured by Olin Corporation in the emergency escape slide inflation system. Accomplish the following:

A. Unless already accomplished, conduct an initial inspection of each cool gas generator propellant cartridge installed on an airplane in accordance with paragraph E prior to accumulation of 6,000 flight hours or 4 years time installed on an airplane, whichever is sooner. For those cartridges which have accumulated, or will have accumulated before May 1, 1978, more than 6,000 flight hours or 4 years time installed on an airplane, compliance may be delayed but must be accomplished by May 1, 1978.

B. (1) Inspect all cool gas generator propellant cartridges installed on airplanes (regardless of flight hours or date installed) in accordance with paragraph E at intervals not to exceed one year. However, if an approved 100 degrees F temperature indicator (Telatemp Corporation, Part Number "Model 747-1-A", or an alternate indicator approved by the Chief, Seattle Area Aircraft Certification Office) was installed on the cool gas generator casing at the time a new cartridge or one that was inspected in accordance with paragraph E was installed, annually inspect the temperature tab. If the tab indicates that 100 degrees F has not been reached, X-ray inspection of the propellant cartridge in accordance with paragraph E is not required. If temperature indication on temperature tabs exceeds 100 degrees F, X-ray inspection of the cartridge in accordance with paragraph E is required.

(2) Telatemp Corporation Part Number Hotspot 100 degrees, and William Wahl Corporation Part Number 210 and Part Number 240 may no longer be installed and used to comply with paragraph B(1) after the effective date of this amendment. Propellant cartridges previously installed in cool gas generators using these temperature indicators to comply with paragraph B(1) must be X-ray inspected per paragraph E prior to May 1, 1981, or within one year since the cartridge was placed into service, or within one year since last X-ray inspection of the cartridge, unless it can be shown that the temperature tabs are functioning properly. Proper functioning may be shown by removing existing temperature tabs and placing them in an oven heated to a temperature between 100 degrees F and 102 degrees F. If the indicator changes color, it may be assumed to be in good condition and the gas generator can be returned to service without X-ray inspection.

C. After the effective date of this AD, all cartridges, prior to installation in a cool gas generator, must be inspected per paragraph E if 180 days have elapsed since the last inspection. Also, after the effective date of this AD, all cartridges, regardless of time elapsed since the last inspection, must be inspected per paragraph E prior to installation in a cool gas generator unless it can be shown that the cartridges have been stored within the temperature limits of +10 degrees F to +90 degrees F.

D. After the effective date of this AD and prior to installation of a cool gas generator on an airplane, inspect each cartridge installed in the generator per paragraph E unless it can be shown that the generator has been stored within the temperature limits of +10 degrees F and +90 degrees F.

E. Inspect in accordance with the inspection procedures of Section III of Boeing Service Bulletin 747-25-2373. Cartridges exceeding the limits of Rocket Research Company (RRC) Service Bulletin 25-015 (RRC SB 0016) dated 5 August 1977, or later FAA approved revisions, are to be removed from service.

F. After May 1, 1979, remove from service all cartridges upon accumulation of 3 years time installed on an airplane.

G. If, for any reason, an airplane is parked for more than 10 consecutive days with the cool gas generator installed, or has been parked for this extended period since the date of last cartridge inspection, and the peak atmospheric temperature outside the aircraft exceeds or exceeded 90 degrees F on any 10 or more days during this parked period, the cartridges must be inspected, unless already accomplished, in accordance with paragraph E as follows:

(1) If the airplane is parked for 20 days or less, the inspection must be made within 15 days following return of the airplane to active flight status;

(2) If the airplane is parked for more than 20 days, the inspection must be made before further flight or before any escape system tests are performed.

Alternate inspections or other actions which provide an equivalent level of safety may be used when approved by the Chief, Seattle Area Aircraft Certification Office.

NOTE: Thermal cycling, at elevated temperatures, of the propellant cartridges installed in cool gas generators can cause excessive swelling and rapid deterioration of the propellant grain. For greater temperature control the cool gas generators should be removed from aircraft which are expected to be parked for extended periods in hot weather. The gas generators should be stored within the temperature limits of +10 degrees F to +90 degrees F.

H. Aircraft requiring immediate inspection may be ferried to a maintenance base in accordance with Sections 21.197 and 21.199 of the Federal Aviation Regulations.

The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1).

All persons affected by this directive who have not already received these documents from the manufacturer, may obtain copies upon request to Boeing Commercial Airplane Company, P.O. Box 3707, Seattle, Washington 98124, and Rocket Research Company, York Center, Redmond, Washington 98052. These documents may also be examined at FAA Northwest Region, 9010 East Marginal Way South, Seattle, Washington 98108.

Amendment 39-3155 became effective April 14, 1978.
Amendment 39-3458 became effective May 14, 1979.
Amendment 39-3887 became effective August 28, 1980.
This amendment 39-4030 becomes effective February 9, 1981.

FOOTER: