AD 80-18-08

80-18-08 JET ELECTRONICS AND TECHNOLOGY, INC.: Amendment 39-3893. Applies to all Model PS-823( ) series Emergency Power Supplies, normally used as power supply for standby attitude indicators.

Compliance is required as indicated unless already accomplished. To prevent loss of emergency electrical power and possible corrosive or thermal damage to the aircraft accomplish the following:

Within the next 100 flight hours or six months time from the effective date of this AD, determine if compliance has already been accomplished by observing the modification decal on the front of the unit. If the modification number listed below has been marked off, no further action is required.

JET Part No. Model Modification No. 501-1075-01 PS-823A 18 501-1075-02 PS-823B 17 501-1075-03 PS-823C 15 501-1075-04 PS-823D 14 501-1075-05 PS-823A/T 21 501-1075-06 PS-823B/T 19 501-1075-07 PS-823C/T 17 501-1075-08 PS-823D/T 16

If the applicable modificationnumber has not been marked off, install modifications in accordance with J.E.T. Service Bulletin SB501-1075-16E, dated February 28, 1979. Modifications must be made by an FAA Certified Repair Station, an FAA approve repair facility, or J.E.T. Upon submission of substantiating data, through an FAA Aviation Safety Inspector, the Chief, Engineering and Manufacturing Branch, FAA Great Lakes Region, may approved an adjustment to compliance time or an equivalent means of compliance.

This amendment becomes effective August 28, 1980.