AD 78-22-10

AD Final Rules - DRS_78-22-10.html
Copy URL
Print/Save as PDF
Document Versions
 Feedback
Details
AD Number:
78-22-10
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731 - 2, - 3 and - 3R Engines
Subject:
Low Pressure Rotor Thrust Ball Bearings
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
11/13/1978
Make:
Honeywell International Inc.
Model:
TFE731-2 | TFE731-3 | TFE731-3R
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Superseded AD: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Superseded By: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: 78-22-10
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-3335

AD NUMBER:   78-22-10

SUBJECT HEADING:   AIRESEARCH MANUFACTURING COMPANY of ARIZONA Model TFE 731 - 2, - 3 and - 3R Engines

ACTION:  

SUMMARY:  

DATES:   Effective November 13, 1978.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
78-22-10 AIRESEARCH MANUFACTURING COMPANY of ARIZONA: Amendment 39-3335. Applies to AiResearch Model TFE 731 - 2, - 3 and - 3R engines of the serial numbers listed certificated in all categories, equipped with low pressure rotor thrust ball bearings (number three bearings), Part No. 358736-2, manufactured by SNFA Bearing Corporation.

This AD applies to the following listed engine serial numbers:

ENGINE SERIAL NUMBERS
74606	77239	73431	73430	73433
74609	77240	80193	84121	74614
74604	74590	74615	74618	78227
77238	77241	73432	75294	77245
74591	74602	84123	84122	77243
84111	74587	76113	84120	78229
74605	75282	74616	75286	78226
74603	75279	74617	76112	77247
74589	75281	75285	77244	74620
75191	74419	77246	74101C	73299
74619	78151	73215	74624	73221
75175	74623	78129	75178	73111
74224	74508	75280	73209	

Compliance required as indicated.

To prevent failure of the low pressure rotor thrust ball bearing which could result in an immediate inflight shutdown of the engine, accomplish the following unless already accomplished.

(a) Before further flight after receipt of this AD, remove from the engine and visually inspect the inner face of both halves of the split inner race of the low pressure rotor thrust ball bearing (number three bearing), Part No. 358736-2, to determine the presence of the six radial oil lubrication grooves.

(1) If the inner face halves of the bearing inner race do not have a total of six radial oil lubrication grooves, the bearing should be removed and replaced with a conforming part which does have the six oil lubrication grooves in the inner face halves of the split inner race.

NOTE: There is an optional method of manufacturing raceway oil slots in low pressure rotor thrust ball bearing, Part Number 358736-2. Three raceway oil slots may be machined into each inner face of both halves of the split inner race or six raceway oil slots may be machined into the inner face of the forward inner race. Both options are acceptable.

NOTE: Bearings found to be improperly manufactured should be returned to the AiResearch Manufacturing Company of Arizona.

(2) If the bearing inner race halves do have the six radial oil lubrication grooves, the bearing may be reassembled, reinstalled and returned to service provided it is found to be otherwise serviceable.

(b) Special flight permits may be issued per FAR 21.197 and 21.199 to authorize operation of aircraft to a base where this inspection required by this AD may be performed provided that there is not more than one affected serial numbered engine listed in this AD installed on the aircraft.

(c) Equivalent inspection procedures and repairs may be used when approved by the Chief, Aircraft Engineering Division, FAA Western Region.

This amendment is effective November 13, 1978 and was effective upon receipt for all recipients of the priority mail letter dated September 22, 1978, which contained this amendment.

FOOTER: