AD 79-06-05

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AD Number:
79-06-05
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
DETROIT DIESEL ALLISON Model 250-C28B and 250-C30 Engines
Subject:
Overspeed Control System
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
03/26/1979
Make:
Rolls-Royce Corporation
Model:
250-C28B | 250-C30
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Superseded AD: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Superseded By: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: 79-06-05
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-3436

AD NUMBER:   79-06-05

SUBJECT HEADING:   DETROIT DIESEL ALLISON Model 250-C28B and 250-C30 Engines

ACTION:  

SUMMARY:  

DATES:   Effective March 26, 1979.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:   79-06-05 DETROIT DIESEL ALLISON: Amendment 39-3436. Applies to Model 250-C28B and 250-C30 engines with overspeed controls DDA P/N's 6895582 and 6894611 respectively, installed in but not limited to Bell 206L-1 and Sikorsky S-76 rotorcraft certificated in all categories.
Compliance required as indicated, unless previously accomplished. To preclude possible engine power loss resulting from moisture in the overspeed control system, accomplish the following:
(A) Before further flight, accomplish the following:
(1) Pull the N2 overspeed circuit breaker and secure by wrapping with tape, or placing a Ty-Wrap around the breaker stem.
(2) Install placard which states "Eng Ovsp Circuit Deactivated" in 3/16" or larger letters adjacent to N2 overspeed circuit breaker on Bell Model 206L-1 rotorcraft. On Sikorsky Model S-76 rotorcraft, install the placard on the panel which contains the N2 circuit breaker and on the panel which contains the N2 overspeed circuit test switch. The engine overspeed test outlined in the RFM will no longer function with the circuit breaker deactivated.
(B) Not later than September 1, 1979, replace the affected engine overspeed controls with new engine overspeed controls DDA P/N's 23001750 for 250-C28 series engines and 23001751 for 250-C30 engines, unless previously accomplished. Concurrent with the accomplishment of this replacement, reactivate the N2 overspeed control by engaging the N2 overspeed circuit breaker and removing the placard "Eng Ovsp Circuit Deactivated." (Commercial Engine Bulletins CEB 73-2009 for the 250-C28 series engines and CEB 73-3006 for the 250-C30 engines also pertain to this subject.)
This amendment becomes effective March 26, 1979.

FOOTER: