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/TB20/35 Fuel System 12/99 Applicability: Model TB20 and TB21 aeroplanes serial numbers 1 to 822, 850 to 889 and 889 to 947 equipped with an engine monitoring cluster at amendment D and having a 14 volt electrical system. Note 1: This Directive is not applicable to aeroplanes with a 24 volt electrical systems. Note 2: The amendment D engine monitoring cluster is not a production fit and is only available as a spare. The amendment D cluster may be identified by markings on the engine monitoring cluster identification plate. Requirement: 1. Install a placard adjacent to the fuel indicator, in accordance with Socata Service Bulletin SB 10-099-28 dated February 1999, stating: If voltage is lower than 13 VOLTS (below green range), fuel quantity is over-estimated. 2. Incorporate the following amendments in the Flight Manual (Pilots Operating Handbook). This may be accomplished by inserting a copy of this Directive in the Flight Manual. 1. In SECTION 3 'EMERGENCY PROCEDURES', immediately following the 'ALTERNATOR FAILURE' procedure insert: b. In SECTION 4 'NORMAL PROCEDURES', in 'PRE-FLIGHT INSPECTIONS' of the 'ELECTRICAL SYSTEMS' procedure, at paragraph 'a — Cabin', insert immediately following the entry 'Fuel gages check': c. In SECTION 4 'NORMAL PROCEDURES', in 'AFTER STARTING ENGINE' procedure, insert immediately before the entry 'Fuel selector set to fullest tank': Note 3: DGAC AD 1999-062(A) refers. COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY SCHEDULE OF AIRWORTHINESS DIRECTIVES Compliance: 1. Before 31 December 1999. 2. Before 31 December 1999. This Airworthiness Directive becomes effective on 2 December 1999. Background: This Directive is issued to ensure that pilots are aware that fuel contents may be over- estimated.