93-22-05

TELEDYNE CONTINENTAL MOTORS

Amendment 39-8744Docket 93-ANE-54

Applicability: Teledyne Continental Motors (TCM) Model O-200A reciprocating engines with Engine Serial
Numbers 256030 through 256037; and TCM C85, C90, O-200, and O-240 series reciprocating engines
with carburetor air intake housing assemblies, Part Numbers (P/N) CE11141, CE11142, 639814,
639815, 641534, and Repair Kit Assemblies, P/N 641689, purchased after August 31, 1991, without a
permanent ink stamp "CSB 93-13" located on the inside of the housing assembly. These engines are
installed on but not limited to the following aircraft: American Champion Models 7BCM, 7CCM, S7CCM,
7DC, S7DC, 7EC, S7EC, 7FC, 7JC, 7ECA, 11BC, S11BC, 11CC, S11CC, and 402; Anderson
Greenwood Model 14; Cessna Model 120, 140, 140A, 150, 150A-M, and A150K-M; Luscombe Model
8E, 8F, and T-8F; McClish (Funk) Model B85C; Piper Model PA-18 and PA-19; Reims Model F150G, H,
J, K, L, M, FA150K, L, FRA150L, and M; Spinks Model Lark 95; Superior (Culver) Model V and V-2;
Taylorcraft Model 19 and F-19; and Univair (Erco, Forney, Alon, Mooney) Model 415E, 415G, F-1, F-1A,
A-2, and M-10.

Compliance: Required as indicated, unless accomplished previously.

To prevent engine failure due to a cracked air valve in the carburetor air intake housing assembly,
accomplish the following:

(a) Within the next 5 hours time in service (TIS) after the effective date of this AD, inspect the
carburetor air intake housing assembly in accordance with paragraph 2 of the Inspection
Procedure section of TCM Critical Service Bulletin (CSB) No. 93-13, dated August 12, 1993.

(1) If the carburetor air intake housing assembly meets the requirements of Paragraph 2A of the
Inspection Procedures of TCM CSB No. 93-13, dated August 12, 1993, no further action is
required.

(2) If the carburetor air intake housing assembly meets the requirements of paragraph 2B of TCM
CSB No. 93-13, dated August 12, 1993, inspect the carburetor air intake housing assembly
for cracks. If cracks are found anywhere in the assembly, prior to further flight replace with a
serviceable assembly.

(b) Thereafter, for assemblies that meet the requirements of paragraph 2B of TCM CSB No. 93-13,
dated August 12, 1993, inspect the carburetor air intake housing assembly for cracks in
accordance with Paragraphs 3 and 4 of the Inspection Procedure of TCM CSB No. 93-13, dated
August 12, 1993, at intervals not to exceed 25 hours TIS since the last inspection. If cracks are
found anywhere in the assembly, prior to further flight replace with a serviceable assembly.

(c) Inspect uninstalled carburetor air intake housing assemblies in accordance with paragraph (a) of
this AD prior to installation.

(d) For the purpose of this AD, a serviceable carburetor air intake housing assembly is defined as:

(1) An assembly purchased on or before August 31, 1991; or

(2) An assembly that meets the inspection criteria of paragraph (a)(1) of this AD; or

(3) An assembly with the following P/N's:

(i) 653661, which supersedes CE11142;

(ii) 653670, which supersedes 639815;

(iii) 653675, which supersedes 641534;

(iv) 653657, which supersedes 641689; or

(4) An assembly, P/N 641534, with a permanent ink stamp "CSB 93-13" located on the inside of
the housing assembly.

NOTE

The assemblies, P/N's CE11141 and 639814, have not been superseded, as these are
assemblies with the air filter included, corresponding to airboxes, P/N's CE11142 and 639815.

(e) Replacement with a serviceable carburetor air intake housing assembly constitutes terminating
action to the inspection requirements of this AD.

(f) An alternative method of compliance or adjustment of the compliance time that provides an
acceptable level of safety may be used if approved by the Manager, Atlanta Aircraft Certification
Office. The request should be forwarded through an appropriate FAA Maintenance Inspector,
who may add comments and then send it to the Manager, Atlanta Aircraft Certification Office.

NOTE

Information concerning the existence of approved alternative methods of compliance with this
airworthiness directive, if any, may be obtained from the Atlanta Aircraft Certification Office.

(g) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the
airplane to a location where the requirements of this AD can be accomplished.

(h) The inspections, and replacement, if necessary, shall be done in accordance with the following
service document:

Document No. Pages Revision Date
TCM CSB No. 93-13 1-3 Original August 12, 1993

Total pages: 3.

This incorporation by reference was approved by the Director of the Federal Register in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Copies may be obtained from Teledyne
Continental Motors, P.O. Box 90, Mobile, AL 36601; telephone (205) 438-3411. Copies may be
inspected at the FAA, New England Region, Office of the Assistant Chief Counsel, 12 New
England Executive Park, Burlington, MA; or at the Office of the Federal Register, 800 North
Capitol Street NW., suite 700, Washington, DC.

(i) This amendment becomes effective December 14, 1993, to all persons except those persons to
whom it was made immediately effective by priority letter AD 93-22-05, issued November 4,
1993, which contained the requirements of this amendment.

FOR FURTHER INFORMATION CONTACT:

Jerry Robinette, Aerospace Engineer, Atlanta Aircraft Certification Office, FAA, Small Airplane
Directorate, 1669 Phoenix Parkway, Suite 210C, Atlanta, GA 30349; telephone (404) 991-3810, fax (404)
991-3606.

CRITICAL SERVICE BULLETIN
CSB93-13
Compliance Necessary To Maintain Safety

SUBJECT: CARBURETOR AIR INTAKE HOUSING ASSEMBLY INSPECTION

PURPOSE:

To provide an inspection procedure and replacement instructions for carburetor air intake housing
assemblies.

COMPLIANCE:

Those carburetor air intake housing assemblies, repair kits and engines listed in the MODELS
AFFECTED must be inspected within the next 10 hours and every 25 hours thereafter until replaced with a
current production assembly.

MODELS AFFECTED:

1) C85, C90, O200A & B, and O240 model engines Carburetor Air Intake Housing Assemblies and
P/N 641689 Repair Kit Assemblies that were purchased from TCM between the dates of
September 1, 1991 and June 30, 1993. The Carburetor Air Intake Housing Assembly part
numbers which are affected are: CE11141, CE11142, 639814, 639815 and 641534 as
identified in paragraph 2B of the Inspections Procedures set forth in this bulletin.

2) All new engines identified below.

The engines listed below must be inspected to determine if the affected assemblies are installed. Those
that have affected assemblies installed must be inspected per the Inspection Procedures set forth in this
bulletin.

 

  

TCM has received reports that the affected carburetor air intake housing assemblies have experienced
cracks in the air valve and in the welds which attach the air valve to the shaft. Therefore, it is necessary to
inspect and replace the affected assemblies in accordance with the following instructions. Affected repair
kits P/N 641689 must be replaced with current production kits.

2 of 3

WARNING

Failure to replace any affected assembly that contains a crack may result in breakage of the air
valve and/or separation of the air valve from its shaft and cause partial or total loss of engine
power.

INSPECTION PROCEDURE

1. Remove engine cowling to gain access to the carburetor air intake housing assembly.

2. Measure the exposed portion of the Teflon bearing. See Figure 1.

A. Those carburetor air intake housing assemblies having an exposed portion of the Teflon
bearing which measures .062 (as shown in Figure 1 A) do not require replacement pursuant
to this bulletin. However, such assemblies should be inspected thoroughly as part of each
100 hour inspection and any discrepancies corrected.

B. Any carburetor air intake housing assembly having an exposed portion of the Teflon bearing
which measures .250 - .282 (as shown in Figure 1 B) must be inspected in accordance with
this bulletin, with repetitive inspections at 25 hour intervals until the assembly is replaced.

3. Remove the air filter so that the air valve and the welds that attach the air valve to the shaft can be
inspected.

4. Inspect the entire carburetor air intake housing assembly for cracks. Using an inspection mirror
and light, thoroughly inspect the welds that attach the air valve to the shaft and the areas of the air
valve adjacent to the welds for cracks. See Figure 2.

REPLACE THE COMPLETE CARBURETOR AIR INTAKE HOUSING ASSEMBLY BEFORE
FURTHER FLIGHT IF CRACKS ARE FOUND ANYWHERE IN THE ASSEMBLY.

5. Inspect the general condition of the entire carburetor air intake housing assembly. Inspect for
wear on the bushings, shaft and lever. Verify that the air valve operates freely with no binding.
CORRECT ALL DISCREPANCIES BEFORE FURTHER FLIGHT.

6. After the initial inspection has been performed, the repetitive 25 hours inspections can in most
cases be performed without removal of the engine cowling.

REPLACEMENT INSTRUCTIONS

All affected carburetor air intake housing assemblies as identified under paragraph 2B above and P/N
641689 repair kit assemblies purchased between the dates of September 1,1991 and June 30, 1993
must be replaced. Such assemblies may continue in service until replacement assemblies are obtained
provided: (1) they contain no cracks or other discrepancies and, (2) they continue to be inspected at 25
hour intervals in accordance with this bulletin.

A replacement assembly must be ordered from TCM as soon as bulletin affectivity has been established.
Orders will be filled as replacement assemblies become available.

Teledyne Continental Motors will replace all carburetor air intake housing assemblies and repair kits
affected by this bulletin (see paragraph 2B) at no charge on an exchange basis and will allow one (1)
hour labor for removal and installation. Claims may be filed through any TCM distributor.

FIGURE 1

DETAIL OF BEARING AND HOUSING

FIGURE 2

CROSS-SECTION OF AIRBOX

CATEGORY 2

FAA APPROVED

TELEDYNE CONTINENTAL MOTORSP.O BOX 90 · MOBILE, ALABAMA 36601

(205) 438-3411