AD 71-14-01

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AD Number:
71-14-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30
Subject:
Fuel Tank Fungus Coating Peeling
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
05/01/1972
Make:
Mitsubishi Heavy Industries, Ltd.
Model:
MU-2B-10 | MU-2B-15 | MU-2B-20 | MU-2B-30
Product Type:
Aircraft
Product Subtype:
Small Airplane
Affected AD:
Superseded AD:
Affected By:
Superseded By:
Service/Office:
Office of Primary Responsibility:
CFR Part Reference:
Part 39
Comments:
AIRWORTHINESS DIRECTIVES FINAL RULES: 71-14-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-1238

AD NUMBER:   71-14-01

SUBJECT HEADING:   Airworthiness Directives; Mitsubishi Models MU-2B-10, MU-2B-15, MU-2B-20, and MU-2B-30

ACTION:  

SUMMARY:  

DATES:   Effective May 1, 1972.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
71-14-01 MITSUBISHI: Amendment 39-1238 as amended by Amendment 39-1438. Applies to Models MU-2B-10 (Serial Numbers 101, 103 through 111, 113, 116, 117, 119, 120); MU-2B-15 (Serial Numbers 114, 115, 118); MU-2B-20 (Series Numbers 005, 102, 121 through 127, 129 through 146, 149 through 151, 154 through 170, 172 through 175, 177 through 180, 182, 184, 185, 187 through 199, 205 through 215); and MU-2B-30 (Serial Numbers 502 through 551).

Compliance required as indicated.

To prevent possible fuel line clogging due to peeling of the DV1180 fungus resistant coating on the inner surface of the main integral tanks, accomplish the following:

(a) For airplanes which have not had the inspection specified in paragraph (c) accomplished within the last 100 hours' time in service, within the next 10 hours' time in service after the effective date of this AD, comply with paragraph (c).

(b) For airplanes which have had the inspection specified in paragraph (c) accomplished within the last 100 hours' time in service, within 100 hours' time in service from the last inspection, comply with paragraph (c).

(c) Visually inspect the inner bottom surface of the main integral fuel tanks in the area below the fuel filler opening for peeling or blistering of the top coating.

(d) If evidence of peeling or blistering is found during the inspection required by paragraph (c), before further flight, comply with paragraph (f) and thereafter repeat the inspection specified in paragraph (c) at intervals not to exceed 200 hours' time in service from the last inspection.

(e) If no evidence of peeling or blistering is found during the inspection required by paragraph (c), repeat the inspection specified in paragraph (c) once within 100 hours' time in service from the last inspection, and thereafter at intervals not to exceed 200 hours' time in service from the last inspection.

(f) Drain the tanks and visually inspect the entire inner surface of the tanks for any additional evidence of peeling or blistering of the top coating. Remove all defective coating and rework the affected areas in accordance with repair instructions provided in Mitsubishi Service Bulletin No. 143A or 143B, Method I, dated April 23, 1971 and January 5, 1972, respectively, or an FAA approved-equivalent, or comply with paragraph (g), of this Airworthiness Directive.

(g) Drain the fuel tanks, remove all the top coating material, and rework the fuel tanks in accordance with Mitsubishi Service Bulletin No. 143B, Method II, dated January 5, 1972, or an FAA approved-equivalent.

(h) The repetitive inspections specified in paragraphs (d) and (e) may be discontinued when the fuel tanks are reworked in accordance with paragraph (g), of this Airworthiness Directive.

Amendment 39-1238 became effective June 30, 1971.

This amendment 39-1438 becomes effective May 1, 1972.

FOOTER: