1AD/SWSA226/47 Amdt 3 - Hydraulic, Electrical and Oxygen System

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Fairchild (Swearingen) SA226 and SA227 Series Aeroplanes

AD/SWSA226/47

Amdt 3

Hydraulic, Electrical and Oxygen System 11/85

Applicability: All model SA226T, SA226-T (B) and SA226-AT and SA226-TC. All model SA227-AT, SA227-TT and SA227-AC.

Requirement: Para 1 - A. Remove both crew seats and gain access to left and right console areas by removing access panels as required.

B. Inspect all circuit breakers, wiring, and wire terminals in each console for security, chafing, foreign matter, support or any other unsatisfactory condition.

C. Inspect hydraulic tubing, with system pressurised, in both console areas for leaking, chafing, security and evidence of fatigue. Inspect support assemblies for satisfactory condition. Open the hydraulic fluid containment bag to inspect the hydraulic lines.

D. Inspect front pressure bulkhead area particularly the brake reservoir vent area, for signs of hydraulic fluid contamination and clean area as necessary.

E. Inspect hydraulic system pressure gauge and tubing for security leaking or chafing. Ensure system pressurised.

F. Inspect brake master cylinder flexible hoses for security, leaking or chafing with brake system pressurised.

G. Check parking brake valve and cable for correct operation and condition.

H. Visually check oxygen lines for separation from moving components and for leakage using MIL-L-2556713 leak detector solution or equivalent as specified in Fairchild Maintenance Manual. Minimum clearance between oxygen lines and all moving parts should be at least 2 inches. Give particular attention to the fittings in the vicinity of the cockpit side panels and instrument panel area and the fittings on the oxygen supply line from the oxygen bottle to the cockpit. If leaks are found, prior to further flight correct as necessary. See Fairchild Maintenance Manual for proper maintenance of lines and fittings.

I. Ensure that electrical cable looms near rudder pedals have adequate clearance when pedals operated through full range of travel.

J. Remove instrument panel glareshield. Inspect condition of wiring, plumbing and equipment behind panel.

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

SCHEDULE OF AIRWORTHINESS DIRECTIVES

K. Check instrument panel and subpanels, instrument plumbing, electrical wiring, and components for condition, security of attachment, chafing, kinks and clearance.

L. Inspect electrical cables in the vicinity of the cockpit side panels for adequate clearance between cables and adjacent components, especially hydraulic and oxygen system components. It is desirable to maintain a 6- inch clearance between oxygen tubing and electrical wires. If this is not possible, fasten all electrical wires securely so that they are not closer than 2 inches to the oxygen tubing. Add additional support or reroute as necessary to prevent wire contact or chafing, which may damage the wire insultation, and clean any contamination from the bundles.

M. Before further flight, correct all discrepancies and remove any hydraulic fluid contamination found during inspections.