TB 1-1520-240-20-99
b. Remove circuit card assembly A5, power supply module, from the signal data converter in accor-
dance with reference 13, section 2-19.
CAUTION
The parts may be damaged by electrostatic discharge (ESD). Ensure
proper ESD precautionary procedures are followed.
c.
Locate the manufacturer's date code on the identification plate of the power supply module.
(1) If the date code is less than 9601, the power supply module is good and the unit may be re-
turned to service.
(2) If the date code is greater than or equal to 9601, the power supply module is bad and must
be corrected in accordance with the procedures in paragraph 9 below.
d. Once the power supply module date code is verified, reinstall circuit card assembly A5, power supply
module, into the signal data converter in accordance with reference 13.
a. If the power supply module date code is less than 9601, return the AN/AVS-7 to service and anno-
tate the aircraft log books and component records appropriately.
b.
If the power supply module date code was greater then or equal to 9601:
(1) Annotate the aircraft log books, DA Form 2408-13-1, with a circled red "X" in the status block
and enter in the fault block "Aircraft restricted from flight operations with the AN/AVS-7 system."
(2) Pull and tie-wrap the aircraft AN/AVS-7 circuit breakers to prevent power up of the
AN/AVS-7 system.
10. Supply/Parts and Disposition.
a. Parts Required. Items cited in paragraph 7 may be required to replace unserviceable items.
b. Requisitioning Instructions. If you have a circuit card that meets the criteria of paragraph 8C(2), call
TRACOR AEROSPACE, INC., Mr. Keith Holliday at (512) 929-2506, or Mr. J.T. Gill at (512) 929-2084 for
a return authorization. Package the card in accordance with local requirements for ESD handling, attach
DD Form 1149, requisition and invoice/shipping document with a legible (in the clear) return address and ship
the card to the following address: TRACOR AEROSPACE, INC., 6500 TRACOR LANE, ATTN: Roy Gamble,
Austin, TX 78725-2070, M/F: Power Supply Rework. A replacement card will be shipped to the address
on the DD Form 1149 withing two working days of receipt of the bad card.
c.
Bulk and Consumable Materials. N/A.
d. Disposition. N/A
e. Disposition of Hazardous Material. N/A.
11. Special Tools, Jigs and Fixtures Required. N/A.
12. Application.
a. Category of Maintenance. AVUM. Aircraft downtime will be charged to AVUM.
b. Estimated Time Required.
(1) Total of 0.25 man-hours using 1 person.
(2) Total of 0.25 hours downtime for one end item.
c.
Estimated Cost Impact to the Field. N/A
d. TB/MWOs to be Applied Prior to or Concurrently with this Inspection. N/A.
3