83-23-04 GENERAL DYNAMICS (Convair): Amendment 39-4772. Applies to General Dynamics (Convair) Models 240-27 converted from T-29B and 240-52 converted from T29D aircraft for civil passenger or cargo use by Hamilton Aviation Company STC SA4025WE or SA4026WE, certificated in all categories.
Compliance is required within 30 days or 100 hours time in service, whichever occurs first, after the effective date of this AD, unless already accomplished.
To prevent undetected failure of the door open warning system, accomplish the following:
A. Install the secondary lock warning switch on the main entrance door and connect it in series with the other two main entrance door open warning switches in accordance with Hamilton Aviation Company Drawing 3623015, Revision D, or Convair Drawing No. 240- 0067361, Change G of Sheet 2, dated 9/18/53.
B. Reconfigure the 28 volts DC and ground circuits associated with the aft cargo door open warning switch, the door open warning relay, the lower forward compartment door open warning switch, and the main entry door warning switches in accordance with Hamilton Aviation Company Drawing No. 3623015, Revision D, or Convair Drawing No. 240-0067361, Change G of Sheet 2, dated 9/18/53.
C. Perform a functional check of door open warning system as follows:
1. Inspect and check main entrance door (MED) primary lock door open warning switch.
2. Inspect and check MED secondary lock door open warning switch.
3. Check all door open warning light circuitry for proper operation.
D. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base for the accomplishment of inspections required by this AD.
E. Alternative inspections, modifications, or other actions which provide an equivalent level of safety may be used when approved by the Manager, Western Aircraft Certification Office, FAA, Northwest Mountain Region, Hawthorne, California.
All persons affected by this directive who have not already received these documents may obtain copies upon request to General Dynamics, Convair Division, P.O. Box 80877, San Diego, California 92138, Attn: Larry Hayes, Manager, Product Support; and Hamilton Aviation Company, Attn: Gordon Hamilton, P.O. Box 11746, Tucson, Arizona 85734. These documents also may be examined at FAA, Northwest Mountain Region, 17900 Pacific Highway South, Seattle, Washington.
This amendment becomes effective November 28, 1983.