AD 86-20-01

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AD Number:
86-20-01
Document Type:
AD Final Rules
Docket Number:
Unknown
Subject Heading:
Airworthiness Directives; Mitsubishi Model MU-2B, -10, -15, -20, -25, -26, -26A, -30, -35, -36, -36...Show more
Subject:
Pitot System Modification
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
10/06/1986
Make:
Mitsubishi Heavy Industries, Ltd.
Model:
MU-2B | MU-2B-10 | MU-2B-15 | MU-2B-20 | MU-2B-25 | MU-2B-26 | MU-2B-26A | MU-2B-30 | MU-2B-35 | MU-...Show more
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Superseded AD: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Superseded By: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: 86-20-01
CITATION:   This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   Unknown

AMENDMENT:   39-5428

AD NUMBER:   86-20-01

SUBJECT HEADING:   Airworthiness Directives; Mitsubishi Model MU-2B, -10, -15, -20, -25, -26, -26A, -30, -35, -36, -36A, -40, and -60 Series Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective October 6, 1986.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
86-20-01 MITSUBISHI: Amendment 39-5428. Applies to Models MU-2B, -10, -15, -20, -25, -26, -26A, -30, -35, -36, -36A, -40, and -60 (Serial Numbers 1 through 753 inclusive, with or without the SA suffix) airplanes certificated in any category.

NOTE: The serial numbers of airplanes manufactured in the United States by MAI under Type Certificate A10SW are suffixed by "SA". The serial numbers of airplanes manufactured in Japan by MHI under Type Certificate A2PC have no suffix.

Compliance required as indicated unless already accomplished.

To assure anti-ice capability of pitot system and proper electric load distribution of anti-ice/deice circuits, accomplish the following:

(a) Before next flight after the effective date of this AD:

(1) Modify the following in accordance with Mitsubishi Heavy Industries (MHI) Ltd., Service Recommendation (SR) 053, Revision A, dated October 23, 1984, or Mitsubishi Aircraft International, (MAI) Inc. SR 020/34-005, Revision B, dated May 24, 1985, as applicable:

(i) The electrical circuitry of the pitot tube and anti-ice/deice systems and,

(ii) The pitot tube system by installing higher heat capacity pitot tube, P/N PH1100.

(2) As an alternate means of compliance:

(i) Before further flight:

(A) Fabricate and install a temporary placard(s) in full view of the pilot, using letters of minimum 0.10 inch in height which state:

(I) "FLIGHT IN KNOWN ICING CONDITIONS IS PROHIBITED".

(II) "TURN PITOT HEAT ON DURING FLIGHT IN VISIBLE MOISTURE".

(III) "Pilot and copilot airspeed indicators may display erroneous data after:

(a) Flight in visible moisture;

(b) Outside storage in rain without pitot covers; or

(c) Washing of airplane. Refer to AFM for corrective action", and

(B) On the "TYPES OF OPERATION" placard located in the cockpit delete, using opaque tape, the words "ICING CONDITIONS", and

(C) Add the following information to the "LIMITATIONS" section of the FAA Approved Airplane Flight Manual (AFM) which supersedes any other AFM information which may be contradictory:

(I) "FLIGHT in known icing conditions is PROHIBITED", and

(II) "TURN PITOT HEAD HEATER ON DURING FLIGHT IN VISIBLE MOISTURE", and

(III) "The pilot and copilot airspeed indicator may display erroneous data after any:

(a) Flight in visible moisture, or

(b) Period of outside storage in rain with no pitot covers installed, or

(c) Washing of airplane with no pitot covers installed.

If erroneous airspeed indication(s) has (have) been observed, corrective action is required prior to next flight by draining the affected pitot line(s) and performing the 'OPERATIONAL CHECK OF PITOT LINE' in accordance with the applicable Mitsubishi MU-2 maintenance manual."

(ii) Within the next 100 hours time-in-service after the effective date of this AD, modify the electrical circuitry of the pitot tube and anti-ice/deice systems in accordance with the applicable service information as follows:

A. Mitsubishi Heavy Industries International (MAI) Ltd., Service Recommendation (SR) 053, Revision A, dated October 23, 1984, or

B. Mitsubishi Aircraft International (MAI), Inc. SR 020/34-005, Revision B, dated May 24, 1985.

(iii) Replacement of the existing pitot tube(s) with the high heat producing pitot tube(s) in accordance with paragraph (a)(1)(ii) of this AD may be delayed until September 1, 1988, if compliance with paragraph (a)(2)(i) of this AD is accomplished prior to further flight.

(b) Insertion of a copy of this AD in the "LIMITATIONS" section of the AFM satisfies the requirements of paragraph (a)(2)(i)(C) of this AD.

(c) The requirements of paragraphs (a)(2)(i)(A), (a)(2)(i)(B) and (b) of this AD may be accomplished by the holder of a pilot certificate issued under Part 61 of the Federal Aviation Regulations on any airplane owned or operated by him. The person accomplishing these actions must make the appropriate aircraft maintenance record entry as prescribed by FAR 91.173.

(d) Remove the temporary placard(s) and AFM textual addition required by paragraph (a)(2)(i) of this AD when the requirements of paragraph (a)(1) of this AD are accomplished.

(e) Airplanes may be flown in accordance with FAR 21.197 to a location where this AD may be accomplished.

(f) An equivalent method of compliance with this AD may be used on the MHI airplanes, if approved by the Manager, Western Aircraft Certification Office, ANM-170W, Federal Aviation Administration, P.O. Box 92007, Worldway Postal Center, Los Angeles, California, 90009-2007, and on the MAI airplanes, if approved by the Manager, Wichita Aircraft Certification Office, ACE-115W, 1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas, 67209.

All persons affected by this directive may obtain copies of the documents referred to herein upon request to Beech Aircraft Corporation (Licensee for Mitsubishi), 9709 East Central, P.O. Box 85, Wichita, Kansas 67201, or FAA, Office of the Regional Counsel, Room 1558, 601 East 12th Street, Kansas City, Missouri 64106.

This amendment supersedes Amendment 39-5006 (50 FR 8321) as amended by Amendment 39-5328 (51 FR 21515), AD 85-04-03R1.

This amendment becomes effective October 6, 1986.

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