81-08-04 PURITAN-BENNETT AERO SYSTEMS COMPANY: Amendment 39-4092. Applies to Puritan-Bennett Aero Systems Company oxygen masks P/N 174039, 174010-01, 174010-03, and ZMR100 series as listed below. NOTE: Masks manufactured without serial numbers are not affected by this AD.
S/N for P/N 174039
0001 through 0012
S/N for P/N 174010-01 and 174010-03
00100 through 00144
146, 147, 149,
00150 through 00194
195 through 259
261 through 273
275 through 292
294 through 390
S/N for P/N ZMR100 series
6603 through 7234
Compliance required as indicated, unless already accomplished.
To prevent the regulator inlet valve from causing either leakage or positive pressure within the facecone, accomplish the following:
(a) Within 120 calendar days from the effective date of this Airworthiness Directive, remove diaphragm assembly P/N F334-1001-1 and install diaphragm assembly P/N F334-1001-1 modified to include diaphragm and plate assembly P/N F334-1003-1, Revision E.
(b) After modification per paragraph (a) of this AD, permanently mark letter "M" at the end of or beneath the mask serial number. This serial number is located under the face cushion on the left-hand side of the hardshell on the 174039 and ZMR100 series masks, and on the back surface of the head harness on the 174010-01 and 174010-03 masks.
(c) The modified diaphragm replacement of paragraph (a) of this AD shall be accomplished by returning the mask to Puritan-Bennett Aero Systems Company, 111 Penn Street, El Segundo, California 90245. However, this replacement in the ZMR100 series masks listed below may be accomplished in the field in accordance with the following Puritan-Bennett Aero System ATA Component Maintenance Manuals:
35-10-25 for the ZMR160 mask
35-10-27 for the ZMR129 mask
35-10-28 for the ZMR129-1 mask
35-10-29 for the ZMR118 mask
NOTE: Puritan-Bennett Aero Systems Company Service Bulletin No. 1, dated April 15, 1980, pertains to the subject of this Airworthiness Directive.
Alternate inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Chief, Engineering and Manufacturing Branch, FAA Western Region.
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. 553(a)(1). All persons affected by this directive, who have not already received these documents from the manufacturer, may obtain copies upon request to Puritan-Bennett Aero Systems Company, 111 Penn Street, El Segundo, California 90245. These documents may also be examined at FAA Western Region Office, Room 6W14, 15000 Aviation Boulevard, Hawthorne, California 90261 and at FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C. 20591.
A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at its headquarters in Washington, D.C. and at FAA Western Region Office.
This AD supersedes Amendment 39-4017, (46 FR 3495) AD 81-02-03, as amended by Amendment 39-4066 (46 FR 16888).
This amendment becomes effective April 23, 1981.