Category: navion, Continental, fuel
Applicability: Continental Model 10-52GB, IG-520BA, I0-520BB, I0-520C, 10-520GB, 10-52GM, 10-520MB; I0-550A, 10-55GB, IO-550C, I0-550G; TSIO-5208, TSIO-520BB, TSIO-520D, TSIO-520DB, TSIO-52GE, TSIO-520EB, TSI0-520J, TSI0~520JB, TSIO-520K, TSIO-520KB, TSIO-520L, TSI0-520LB, TSIO-520N, TSIO-520NB, TSIO-520UB, TSIO-520VB, TSIO-520WB; TSIO-550B; and TSIOL-5SGA and TSIOL-55GB reciprocating engines, with serial numbers lower than those listed in TCM Mandatory Service Bulletin (MSB) No. M93-9, Revision 1, dated March 10, 1993;
which are equipped with the following
fuel pumps:
Part Numbers (P/N) 646210-1, -2,
-8, -10, -11; P/N 646212-2, -5, -16, -17; P/N 646758-5, -7, -8, -9; P/N
646765-6 and -7; P/N 646766-1 and
-2; 646767-1; 649368-19; or engines
equipped with any fuel pump, regardless of part number that have had the
fuel pump replaced in the field prior to the effective ciate of this At)
with fuel pump drive shaft, P/N 646176, installed.
Supersedes: n/a
Compliance: Compliance: Required as indicated
Procedure: To prevent possible fuel pump drive shaft disengagement and loss of engine power, accomplish the following:
(a) Within the next 30 hours time
in service after receipt of this priority letter, visually inspect the
fuel pump to determine which combination of fuel pump drive shaft and fuel
pump drive coupling is installed, and replace, if necessary, fuel pump
drive couplings that have less than the minimum required coupling engagement
with longer fuel pump drive couplings, in accordance with Figure 1 of TCM
MSB No. M93-9, Revision l, dated March 10, 1993, as follows:
(1) If fuel pump drive shaft, P/N
646176, is installed with fuel pump drive coupling, P/N 631263, replace
the fuel pump drive coupling with a serviceable fuel pump drive coupling,
P/N 653359.
(2) If fuel pump drive shaft, P/N
643689, is installed with either fuel pump drive coupling, P/N 631263 or
653359, no further action is required.
(3) If fuel pump drive shaft, P/N
646176, is installed with fuel pump drive coupling, P/N 653359, no further
action is required.
(b) 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 omments 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.
(c) 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.
(d) Copies of the applicable service
information may be obtained from Teledyne Continental Motors, P.O. Box
90, Mobile, AL 36601; telephone (205) 438-3411. This information may be
examined at the FAA, New England Region, Office of the Assistant Chief
Counsel, 12 New England Executive Park, Burlington, MA.
(e) Priority Letter AD 93-16-15,
issued September 27, 1993, becomes effective upon receipt.
Notes: 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.
AD-93-16-15