AD 72-16-05

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AD Number:
72-16-05
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
ROLLS ROYCE (1971) LTD Models Dart 506, 510, 511, 514, 525 through 529, 531, 532, and 542 Series Engines
Subject:
Impellers
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
12/04/1972
Make:
Rolls-Royce Deutschland Ltd & Co KG
Model:
Dart 506 | Dart 510 | Dart 511 | Dart 511-7E | Dart 514 | Dart 514-7 | Dart 525 | Dart 525F | Dart 5...Show more
Product Type:
Engine
Product Subtype:
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 72-16-05
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1568

AD NUMBER:   72-16-05

SUBJECT HEADING:   ROLLS ROYCE (1971) LTD Models Dart 506, 510, 511, 514, 525 through 529, 531, 532, and 542 Series Engines

ACTION:  

SUMMARY:  

DATES:   Effective December 4, 1972.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
72-16-05 ROLLS ROYCE (1971) LTD: Amendment 39-1491 as amended by Amendment 39-1568. Applies to Dart Series Models 506, 510, 511, 514, 525 through 529, 531, 532, and 542 engines and all variants.

Compliance required as indicated unless already accomplished.

To prevent engine failures resulting from fatigue cracks of the impellers specified in Column 2 of the following tables, accomplish the following:

(a) Within the next 50 flights after the effective date of this AD or before the accumulation of the number of flights specified in Column 3, for the applicable impeller, whichever occurs later, and thereafter at intervals not to exceed the number of flights specified in Column 3, replace the applicable impellers specified in Column 2 when they are installed on the engines specified in Column 1 with impellers having the same part number or a part number approved for that engine which have not exceeded their life limits.

(Column 1)
DART ENGINE SERIES	(Column 2)
IMPELLERS	(Column 3)
LIFE LIMITS (FLIGHTS)
	Second stage impellers incorporating all Pre 797 Modifications	4,500
	Second stage impellers incorporating Modification 797 which have not been Open Bore Processed.*	9,000
Models 506, 510, 511 and 514 and all variants	First and second stage impellers incorporating Modification 797 Open Bore Processed.*	1st stage -
10,500
2nd stage -
6,000
	Second stage impeller incorporating Modification 1455.	14,000 since the incorporation
of Modification 1455
	Second stage impellers incorporating all Pre 797 Modifications	4,500
Models 525 through 529, 531, and 532 and all variants	Second stage impellers incorporating Modification 797 which have not been Open Bore Processed.*	14,000
	First and second stage impellers incorporating Modification 797 Open Bore Processed.*	lst stage
9,000
2nd stage -
11,000

*NOTE: For purposes of this AD "Open Bore Processed" means that the impeller during an overhaul subsequent to the incorporation of Modification 797, has been stripped and anodized or anodized, without the impeller bore being fitted with blanks, or that leakage past the blanks has occurred due to an improper fitting of the blanks.

(b) Within the next 50 flights after the effective date of this amendment, (Amdt. 39-1568, effective December 4, 1972), or before the accumulation of the number of flights specified in Column 3, for the applicable impeller, whichever occurs later, and thereafter at intervals not to exceed the number of flights specified in Column 3, replace the applicable impellers specified in Column 2 when they are installed on the engines specified in Column 1 with impellers having the same part number or a part number approved for that engine, which have not exceeded their life limits.

Column 1
DART ENGINE SERIES	Column 2
IMPELLERS	Column 3
LIFE LIMITS
(FLIGHTS)
Models 506, 510, 511, 514 and all variants	First stage impellers
incorporating Modification1455	14,000 since the incorporation of Modification 1455
Models 525 through 529, 531, and 532 and all variants	First stage impellers incorporating Modification1455	11,500 since the incorporation of Modification 1455
Models 542-4 and 542-10 and all variants	Second stage impellers incorporating all PreModification 1455 modifications

Second stage impellers incorporating Modification 1455

Second stage impellers
incorporating Modification1475	12,000




16,000 since the incorporation of Modification 1455


14,500

(c) For the purpose of complying with this AD a flight shall constitute an engine operating sequence consisting of an engine start, takeoff operation, landing and engine shut-down. The number of flights may be determined by actual count or, subject to approval, by the FAA assigned maintenance inspector, by dividing the impeller time in service by the operator's fleet average time per flight.

Amendment 39-1491 became effective July 31, 1972.

This amendment 39-1568 becomes effective December 4, 1972.

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