AD 90-06-03 R1

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AD Number:
90-06-03 R1
Document Type:
AD Final Rules
Docket Number:
90-CE-10-AD
Subject Heading:
Airworthiness Directives; CESSNA Model 172 Airplanes
Subject:
Exhaust Heater/Muffler Assembly
Status:
Current
Citation:
This information is not available.
Citation Publish Date:
Effective Date:
03/27/1991
Make:
Cessna Aircraft Company
Model:
172 | 172A | 172B | 172C | 172D | 172E | 172F (USAF T-41A) | 172G | 172H (USAF T-41A) | 172I | 172K ...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Superseded AD: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Superseded By: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: 90-06-03 R1
CITATION:  
This information is not available.

PAGE NUMBER:  

DOCKET NUMBER:   90-CE-10-AD

AMENDMENT:   39-6927

AD NUMBER:   90-06-03 R1

SUBJECT HEADING:  
Airworthiness Directives; CESSNA Model 172 Airplanes

ACTION:  

SUMMARY:  

DATES:   Effective March 27, 1991.

ADDRESSES:  

FOR FURTHER INFORMATION CONTACT:  

SUPPLEMENTARY INFORMATION:  

REGULATORY TEXT:  
90-06-03 R1 CESSNA: Amendment 39-6528 as revised by Amendment 39-6927, Docket No. 90-CE-10-AD.

Applicability: Model 172 airplanes (serial numbers 36216 through 36769) that have not been modified with Cessna Service Kit SK-172-10 or SK-172-10A, certificated in any category.

Compliance: Required within the next 25 hours time-in-service after the effective date of this AD, unless already accomplished.

To prevent cracking of the exhaust heater/muffler that could result in dangerous carbon monoxide levels, accomplish the following:

(a) Inspect the exhaust heater/muffler assembly for cracks in accordance with the procedures as outlined in the applicable Cessna Service Manuals, or the following:

(1) Remove and disassemble the exhaust heater/muffler assembly by removing the shroud assembly.

(2) Visually inspect the exhaust heater/muffler, Cessna Part Number 0550157-32, for cracks, or submerge the muffler in water and pressure test at 5 pounds p.s.i.

NOTE 1: Particular attention should be given to the cylindrical surface that contains the heat transfer pins.

(3) If cracks, breaks, or any leakage is found in the exhaust heater/muffler area, prior to further flight, replace the exhaust heater/muffler with an airworthy part.

(b) Modify the airplane by the installation of Cessna Service Kit SK-172-10A.

NOTE 2: Cessna Service Letter (SL) 170/172-11, dated February 3, 1958, and Cessna SL 170/172-13, dated April 7, 1958, contain information that pertains to the subject of this AD.

(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a location where the requirements of this AD can be accomplished provided that the cabin air control remains in the "OFF" position.

(d) An alternate method of compliance or adjustment of the compliance time that provides an equivalent level of safety may be approved by the Manager, Wichita Aircraft Certification Office, Mid-Continent Airport, 1801 Airport Road, Room 100, Wichita, Kansas 67209. The request should be forwarded through an appropriate FAA Maintenance Inspector, who may add comments and then send it to the Manager, Wichita Aircraft Certification Office.

(e) All persons affected by this directive may obtain copies of the documents referred to herein upon request to the Cessna Aircraft Corporation, P.O. Box 7704, Wichita, Kansas 67277; or may examine the service letters at the FAA, Central Region, Office of the Assistant Chief Counsel, Room 1558, 601 E. 12th Street, Kansas City, Missouri 64106.

Airworthiness Directive 90-06-03 R1 revises AD 90-06-03, Amendment 39-6528. {{Amendment 39-6528 supersedes AD 58-08-02.}}

This amendment (39-6927, AD 90-06-03 R1) becomes effective on March 27, 1991.

FOOTER: