Document ID: chunk:federal_register_of_legislation:F2006B08792:body:0:p2
Version: federal_register_of_legislation:F2006B08792
Segment Type: other
Provision Reference: 
Character Range: 2797–6104

of the extinguishant, by weight, enters the intake.

                (c)     Ensure that extinguisher lines and spray rings forward of the firewall are of fireproof construction, except that short flexible lengths may consist of fire- resistant coupled hose assemblies.

                (d)     Where the extinguisher bottles are electrically operated, arrange the firing circuit so that the failure of the wiring to any one bottle will not affect the operation of the remaining bottles.

             Fluid Shut-off Valves:

             Install shut-off valves in the fuel, oil and hydraulic fluid systems, as follows:-

                (a)     Mount valves immediately to the rear of each nacelle firewall and insert in the lines conveying fluid to the appropriate engine-driven pump.

                (b)     Install valves so that they are capable of being operated rapidly while the aeroplane is in flight.

             Ventilation of Electrical Accessories:

                (a)     Modify the ventilation systems for the generator and magnetos so that the source of their air intake is not within the accessory compartment or adjacent to the exhaust stack.

                (b)     Replace with appropriate fire-proof components, ventilating tubes and ducts in cases where their burning through or collapse could permit the spread of fire from the engine compartment to the accessory compartment.

             Fluid Lines:

                (a)     Replace, with approved flexible fire-resistant hose assemblies, all lines which carry flammable fluids or gases within the accessory compartment. Alternatively, fire-proof rigid lines may be used, connected to fire-resistant coupled flexible hose assemblies.

                (b)     Replace, with a fire-proof line, the line from the oil tank to the propeller feathering pump and the oil tank drain line where these lines lie forward of the firewall.

           Note: For the purpose of this Directive a fire-resistant hose assembly wrapped in asbestos lagging enclosed in a synthetic rubber or P.V.C. sheath may be regarded as fireproof.

             Electric cables:

(a)     Ensure that wiring forward of the firewall is P.V.C. insulated glass braided cable to Specification AN-J-C-48a or other cable approved as fire-resistant Class II for the following circuits:-

                      (I)      Fire detectors

                      (II)    Propeller feathering

                      (III) Those portions of the starter circuit in which a fault could adversely affect the propeller feathering.

   (b)     Protect cables with glass outer braiding from abrasion by wrapping with
P.V.C. tape, shrouding with P.V.C. tubing, or by other approved means.

(c)     Sleeve cables in electrically unprotected circuits either individually, in P.V.C. tubing, or enclose in metal conduit. Before enclosing in metal conduit protect glass outer braided cables from abrasion in accordance with subparagraph (b) above.

(d)     Install cables and cable runs forward of the firewall in the cooler parts of the engine nacelle. Arrange cable runs so that they are not exposed to mechanical damage during normal engine operation or during maintenance. Cables and cable conduits shall not be directly clipped to the engine diaphragm.

                 Sealing