AD/TB20/13 Amdt 1 - Fuel Tanks (Cth)

COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES

Aerospatiale (Socata) TB20 (Trinidad) Series Aeroplanes

AD/TB20/13 Amdt 1

Applicability: Model TB20 and TB21.

Fuel Tanks 5/90

Requirement: 1. Unless modified in accordance with Requirement 2, carry out the following action:

(a) Position the aircraft in a wings level and a nose-down ground attitude of about 2 degrees.

Note: This is achieved on level ground when the height from the ground to the spinner centre equals the height from the ground to the lower part of the rear mooring fitting.

(b) Leave the aircraft in this attitude for at least 20 minutes, then drain as described in (c) below; drain from each point at least 500 ml of fuel.

(c) Aircraft S/N 1 to 730:

Drain L.H wing fuel tank then R.H wing fuel tank.

Note: On TB20 and TB21 airplanes, the fuel filter which is located under engine cowling should not be drained as it is not the low point of fuel system. Should filter be drained, apply procedure given in Maintenance Manual concerning filter installation and removal.

Aircraft from S/N 731:

(i) Select L.H fuel tank

(ii) Drain L.H wing fuel tank

(iii) Drain fuel filter under fuselage

(iv) Drain R.H wing fuel tank.

(d) Visually inspect fuel filter caps seals (broken, cracked, torn, kinked) and replace if necessary.

Install caps and check security.

2. Modify the fuel tanks in accordance with Socata TB Service Bulletin No. 48.

Note: DGAC AD 89-177(A) and Socata TB Service Bulletin No 48 refer.