Commonwealth legislation

AD/HS 125/112 - Water System

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Commonwealth

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legislative instrument

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This directive requires operators of certain British Aerospace BAe 125-600A/700A/800A aircraft fitted with an aft lavatory water system (installed under STC SA 2271 SW) to drain the aft water reservoir, pull the pressure-pump circuit breaker beneath the aft vanity, and secure it with a tie-wrap until an Authority‑approved modification allows reactivation. Compliance must occur before a Certificate of Airworthiness is issued. The measure responds to a reported leak that led to ice formation and aileron control jamming.

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AD/HS 125/112 - Water System

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

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British Aerospace BAe 125 Series Aeroplanes

AD/HS 125/112 Water System 11/90

Applicability: Model 125-600A, 125-700A, and 125-800A series equipped with a cabin interior and aft lavatory water system installed in accordance with STC SA 2271 SW.

Requirement: Drain all water from the aft lavatory water system reservoir, deactivate the water system pressure pump by pulling the circuit breaker located beneath the vanity in the aft lavatory, and install a tie wrap on the circuit beaker to prevent it from being reset.

Note 1: FAA AD 90-08-07 Amdt 39-6600 refers.

Note 2: Reactivation will be dependent upon the design of a modification that is acceptable to the Authority.

Compliance: Prior to the issue of a Certificate of Airworthiness.

Background: This Airworthiness Directive is raised in response to a FAA report of an aft lavatory water system leak, which caused the aileron control system to jam due to the resulting ice formation on the aileron control cables and fairleads.

Source text

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

1 AD/HS 125/112 - Water System