AD 90-15-01

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AD Number:
90-15-01
Document Type:
AD Final Rules
Docket Number:
90-ASW-39
Subject Heading:
Airworthiness Directives; ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER) Model UH-12E, UH-12...Show more
Subject:
Tail Rotor Blade Assemblies
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
03/07/1991
Make:
Hiller Aviation | Siam Hiller Holdings, Inc.
Model:
UH-12L | UH-12L4 | UH-12E | UH-12E-L
Product Type:
Aircraft
Product Subtype:
Rotorcraft
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 90-15-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-ASW-39

AMENDMENT:   39-6879

AD NUMBER:   90-15-01

SUBJECT HEADING:   Airworthiness Directives; ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER) Model UH-12E, UH-12E-L, UH-12L, and UH-12L4 Series Helicopters

ACTION:   Final Rule of priority letter AD

SUMMARY:  

DATES:   Effective March 7, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-15-01 ROGERSON HILLER CORPORATION (HILLER, FAIRCHILD HILLER): Amendment 39-6879. Docket No. 90-ASW-39. Final Rule of priority letter AD.

Applicability: All Model UH-12E, UH-12E-L, UH-12L, and UH-12L4 series helicopters, certificated in any category.

Compliance: Required prior to further flight, unless already accomplished.

To prevent failure of a tail rotor blade assembly, which could result in loss of controllability of the helicopter, accomplish the following:

(a) Determine the part number and serial number of the tail rotor blade assemblies installed on the helicopter. The serial number is located on a raised rectangular boss on the barrel section of the blade root fitting.

(b) If any tail rotor blade assembly installed is P/N 55073 and is identified with any of the serial numbers listed below, regardless of the hours' time in service, remove and replace the blade assembly with an airworthy part before further flight:

Serial Numbers:	3028	3089	9506	9584
	9607	10245	10516	10917
	13278	14715	14898	15073
	15285	15978	16114	20918

NOTE: Any unairworthy blade assemblies found as a result of this AD should be permanently marked as unairworthy.

(c) If any of the tail rotor blade assemblies listed in paragraph (b) are found, report the helicopter registration number, serial number, and tail rotor blade assembly serial number to the Manager, Seattle Aircraft Certification Office (ACO), FAA, Northwest Mountain Region, Transport Airplane Directorate, within 10 days of the inspection required by paragraph (a) of this AD.

(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate helicopters to a base in order to comply with the requirements of this AD.

(e) Record compliance with paragraph (b) in the AD compliance record and in the maintenance record of the helicopter log book. This record must include the serial number of any deficient blade assembly found during compliance with this AD.

(f) An alternate means of compliance or adjustment of the compliance time, which provides an equivalent level of safety, may be used when approved by the Manager, Seattle ACO, FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington.

Note: The request should be submitted directly to the Manager, Seattle ACO, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Seattle ACO.

This amendment (39-6879, AD 90-15-01) becomes effective on March 7, 1991, as to all persons, except those persons to whom it was made immediately effective by Priority Letter AD 90-15-01, issued on July 11, 1990, which contained this amendment.

FOOTER: