Commonwealth legislation

AD/F50/66 - Lavatory Pump and Filter Assembly Electrical Grounding

In ForceCTH

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Commonwealth

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legislative instrument

Plain English Summary

2/10 complexity

This directive requires operators of the listed Fokker F27 Mk50 (F50) aeroplanes to install an electrical ground between the lavatory pump/motor housing and the aircraft grounding system per Fokker Service Bulletin F50‑25‑046 Rev 1, to eliminate a risk that a motor fault could leave the toilet bowl at high voltage. Compliance is mandatory by 10 May 1995; costs and specific work hours are determined by following the manufacturer’s bulletin.

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AD/F50/66 - Lavatory Pump and Filter Assembly Electrical Grounding

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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Fokker F50 (F27 Mk 50) Series Aeroplanes

AD/F50/66 Lavatory Pump and Filter Assembly Electrical Grounding

12/94

Applicability: Model F27 Mk50 aircraft serial numbers 20103 through 20226 inclusive, 20270 through 20292 inclusive, 20296 through 20304 inclusive, 20306, 20307, 20309,

20310 and 20312.

Requirement: Action in accordance with accomplishment instructions of Fokker Service Bulletin F50-25-046 Revision 1 dated 5 August 1994.

Note: RLD AD 94-129 (A) dated 31 August 1994 refers.

Compliance: Prior to 10 May 1995.

Background: The Lavatory Pump and Filter Assembly is driven by a 115V AC motor and the metal toilet bowl is connected to the housing of the electric motor.

However, the motor housing is not connected to an effective ground. Consequently, should a failure of the electric motor occur, the toilet bowl may carry a high voltage. This Directive requires the installation of an electrical ground connection.

Source text

Sourced from the Federal Register of Legislation (legislation.gov.au), CC BY 4.0.

1 AD/F50/66 - Lavatory Pump and Filter Assembly Electrical Grounding