AD 99-15-05

AD Final Rules - 991505.pdf
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AD Number:
99-15-05
Document Type:
AD Final Rules
Docket Number:
97-NM-49-AD
Subject Heading:
(Correction) Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50
Subject:
Corners Of Aft Lower Cargo Doorjamb
Status:
Current
Citation:
(Federal Register: July 14, 1999 (Volume 64, Number 134))
Citation Publish Date:
07/14/1999
Effective Date:
08/18/1999
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Superseded AD: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Superseded By: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 (64 FR 37838 No. 134 07/14/1999)
Comments:
CORRECTION: (Federal Register: September 10, 1999 (Volume 64, Number 175); Page 49080-49082; www.acc...Show more
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[Federal Register: September 10, 1999 (Volume 64, Number 175)]


[Rules and Regulations]


[Page 49080-49082]


From the Federal Register Online via GPO Access [wais.access.gpo.gov]


[DOCID:fr10se99-3]


–––––––––––––––––––––––––––––––––––


DEPARTMENT OF TRANSPORTATION


Federal Aviation Administration


14 CFR Part 39


[Docket No. 97-NM-49-AD; Amendment 39-11224; AD 99-15-05]


RIN 2120-AA64


Airworthiness Directives; McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 Series


Airplanes, and C-9 (Military) Airplanes


AGENCY:
 
Federal Aviation Administration, DOT.


ACTION:
 
Final rule; correction.


–––––––––––––––––––––––––––––––––––


SUMMARY:
 
This document corrects information in an existing airworthiness directive (AD) that


applies to certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-


9 (military) airplanes. That AD currently requires a one-time visual inspection to determine if all


corners of the aft lower cargo doorjamb have been previously modified. That AD also requires low


frequency eddy current inspections to detect cracks of the fuselage skin and doubler at all corners of


the aft lower cargo doorjamb, various follow-on repetitive inspections, and modification, if


necessary. This amendment corrects two typographical errors involving reference to a certain


Principal Structural Element (PSE) and correction of a compliance time. This correction is necessary


to ensure that the correct PSE is inspected, and that an appropriate period of time is permitted for


compliance with a certain inspection.


DATE:
 
Effective August 18, 1999.


The incorporation by reference of certain publications listed in the regulations was approved


previously by the Director of the Federal Register as of August 18, 1999 (64 FR 37838, July 14,


1999).


FOR FURTHER INFORMATION CONTACT:
 
Wahib Mina, Aerospace Engineer, Airframe


Branch, ANM-120L, FAA, Los Angeles Aircraft Certification Office, 3960 Paramount Boulevard,


Lakewood, California 90712; telephone (562) 627-5324; fax (562) 627-5210.


SUPPLEMENTARY INFORMATION:
 
On July 7, 1999, the Federal Aviation Administration


(FAA) issued AD 99-15-05, amendment 39-11224 (64 FR 37838, July 14, 1999), which applies to


certain McDonnell Douglas Model DC-9-10, -20, -30, -40, and -50 series airplanes, and C-9


(military) airplanes. That AD requires a one-time visual inspection to determine if all corners of the


aft lower cargo doorjamb have been previously modified. That AD also requires low frequency eddy


current inspections to detect cracks of the fuselage skin and doubler at all corners of the aft lower
2


cargo doorjamb, various follow-on repetitive inspections, and modification, if necessary. That AD


was prompted by fatigue cracks found in the fuselage skin and doubler at the corners of the aft lower


cargo doorjamb. The actions specified by that AD are intended to detect and correct such fatigue


cracking, which could result in rapid decompression of the fuselage and consequent reduced


structural integrity of the airplane.


Need for the Correction


The FAA has noted that a typographical error exists in paragraph (d) of the existing AD that


involves the compliance time for performing a high frequency eddy current (HFEC) inspection to


detect cracks on the skin adjacent to a certain modification of the corners of the right lower cargo


doorjamb. That AD specified that the HFEC inspection should be performed ''prior to the


accumulation of 28,000 landings since accomplishment of that modification, or within 3,500 landings


after the effective date of the AD.'' However, the intent of the FAA was to specify ''prior to the


accumulation of 28,000 landings since accomplishment of that modification, or within 3,575 landings


after the effective date of the AD.'' Paragraph (d) of the existing AD has been revised to correctly


specify 3,575 landings.


Additionally, a typographical error occurred in the identification of the Principle Structural


Element (PSE) specified in paragraph (e) of the existing AD. The PSE was identified as ''PSE


53.09.033;'' however, the appropriate number for the PSE should have been identified as ''53.09.035;''


That correction has been included in this AD.


Correction of Publication


This document corrects the typographical errors in AD 99-15-05, and correctly adds the AD as


an amendment to section 39.13 of the Federal Aviation Regulations (14 CFR 39.13).


The final rule is being reprinted in its entirety for the convenience of affected operators. The


effective date of the AD remains August 18, 1999.


Since this action only identifies the appropriate PSE to be inspected and corrects a compliance


time (which actually extends the compliance period somewhat from the existing AD), it has no


adverse economic impact and imposes no additional burden on any person. Therefore, the FAA has


determined that notice and public procedures are unnecessary.


List of Subject in 14 CFR Part 39


Air transportation, Aircraft, Aviation safety, Incorporation by reference, Safety.


Adoption of the Correction


Accordingly, pursuant to the authority delegated to me by the Administrator, the Federal


Aviation Administration amends part 39 of the Federal Aviation Regulations (14 CFR part 39) as


follows:


PART 39–AIRWORTHINESS DIRECTIVES


1. The authority citation for part 39 continues to read as follows:


Authority: 49 U.S.C. 106(g), 40113, 44701.


§ 39.13 [Corrected]


2. Section 39.13 is amended by correctly adding the following airworthiness directive (AD):