Ignition Cables - Piper Malibu Meridian PA-46-500TP Airplane Maintenance Manual

(5) Inspect exterior cylindrical area of igniter shell electrode end for chaffing wear. (Wear is
acceptable to a depth of 0.015 inch.)
(6) If erosion equals or exceeds amounts shown in Chart 1 for igniter; replace igniter.
(7) Check air cooling holes are clear and unobstructed.
2. Ignition Cables (See Figure 2.)
The two ignition cable assemblies consist of electrical leads contained in flexible metal braiding with
coupling nuts at each end. Observe all safety precautions when working on ignition system. See also
Pratt & Whitney Canada's Maintenance Manual - Turboprop Gas Turbine Engine Model(s) PT6A-38/-40/-
41/-42/-42A - Part No. (P/N) 3021442, 74-20-00.
NOTE: Ignition cable routing on the Meridian does not penetrate the fireseals or plenum. The cables run
outside the plenum, along its left side, and then down or across the forward side of the plenum
to their respective igniters.
A. Removal
(1) Remove forward upper cowling.
(2) Remove power from ignition system.
WARNING: RESIDUAL VOLTAGE IN THE EXCITER CAN BE VERY HIGH. ENSURE
(3) Disconnect ignition cable coupling nuts from ignition exciter and spark igniters.
CAUTION: WHEN UNSCREWING COUPLING NUTS, DO NOT ALLOW BRAIDING,
(4) Remove the retaining screws, nuts and washers on the P-clamps supporting the ignition
cables.
(5) Remove ignition cables.
B. Installation
CAUTION: NEVER USE LUBRICANT CONTAINING GREASE OR SILICONE, OR
CAUTION: DO NOT APPLY LUBRICATION TO ANY CABLES WITH TEFLON INSULATED
(1) Install the ignition cables in their respective P-clamps, working from their igniters to the exciter
box. Loosely install the retaining screws, washers and nuts.
(2) Connect coupling nuts of ignition cables to proper connectors on exciter and to their respective
igniters.
CAUTION: DO NOT ALLOW IGNITION CABLE BRAIDING OR FERRULES TO ROTATE
(3) Tighten coupling nuts fingertight, plus 45 degrees. On the exciter box only, safety with lockwire.
(4) Secure cables in P-clamps with retaining screws, washers and nuts.
(5) Gather any excess cable and and neatly secure it to itself with cable ties at the forward left
corner of the plenum.
(6) Reinstall forward upper cowling.
7G15
PIPER AIRCRAFT, INC.
PA-46-500TP, MALIBU MERIDIAN
MAINTENANCE MANUAL
IGNITION IS OFF AND SYSTEM IS INOPERATIVE FOR AT LEAST SIX (6)
MINUTES BEFORE REMOVING COMPONENTS. ALWAYS USE INSULATED
TOOLS AND REMOVE COUPLING NUTS AT EXCITER END FIRST. DO NOT
TOUCH OUTPUT CONNECTORS OR COUPLING NUTS WITH BARE HANDS.
FERRULES OR IGNITER TO TURN AT THE SAME TIME.
LUBRICANTS SUCH AS PETROLATUM ON ANY IGNITION COMPONENT.
SLEEVES.
WHEN SCREWING ON COUPLING NUTS.
74-20-00
Apr 15/07
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