AD 74-22-01

AD Final Rules - DRS_74-22-01.html
Copy URL
Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
74-22-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; MCDONNELL DOUGLAS DC-9 -10, -20, -30, -40, C-9A and C-9B Series Airplanes
Subject:
Engine Mounts
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
06/12/1979
Make:
The Boeing Company
Model:
DC-9-11 | DC-9-12 | DC-9-13 | DC-9-14 | DC-9-15 | DC-9-15F | DC-9-21 | DC-9-31 | DC-9-32 | DC-9-32 (...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Superseded AD: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Superseded By: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: 74-22-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-3487

AD NUMBER:   74-22-01

SUBJECT HEADING:   Airworthiness Directives; MCDONNELL DOUGLAS DC-9 -10, -20, -30, -40, C-9A and C-9B Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective June 12, 1979.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
74-22-01 MCDONNELL DOUGLAS: Amendment 39-1995, as amended by amendment 39-3487. Applies to all Model DC-9 -10, -20, -30, -40 and military C-9A and C-9B Series airplanes equipped with welded aft engine isolator mount(s), P/N K2219-6SA3, certificated in all categories.

To detect cracks in the welded aft engine mounts, accomplish the following:

For airplanes equipped with welded aft engine isolator mount(s) with more than 4,000 hours time-in-service on the effective date of this AD, within the next 300 hours time-in-service, unless previously accomplished within the last 450 hours time-in-service, and thereafter at intervals not to exceed 850 hours time-in-service, inspect the aft engine mount per McDonnell Douglas All Operators' Letter AOL 9-786, dated December 13, 1973, AOL 9-786A dated March 27, 1974, AOL 9-786B dated April 8, 1974, or an equivalent approved by the Chief, Aircraft Engineering Division, FAA Western Region. If any cracks are detected replace the part before further flight with a forged part, P/N's K2219-6SA5 and K2219-7SA3, or an uncracked welded part K2219-6SA3. Upon installation of a forged part the requirements of this A.D. are terminated.

NOTE: (A) For the purposes of this A.D. if the time-in-service hours of the aft engine isolator mount cannot be established the part will be considered to have the same number of time-in-service hours as the airplane on which it is installed.

(B) The airplane may be flown in accordance with FAR's 21.197 21.199 to a base where the inspection can be performed.

Amendment 39-1995 became effective November 25, 1974.

This amendment 39-3487 becomes effective June 12, 1979.


FOOTER: