-------------------------------------------------------------------------------ACTION RESULT -------------------------------------------------------------------------------
5.
 Push the NEXT PAGE function key.

6.
 Push the line key adjacent to the APU indication.

 7.
 Push the line key adjacent to the CLASS 3 FAULTS indication.

8.
 Push the line key adjacent to the RETURN indication until: ________

5. Close-up
 Subtask 49-40-00-860-051
-The 2nd. SYSTEM REPORT/TEST page comes into view.
The APU system page comes into view.
The APU CLASS 3 FAULTS page comes intoview.
 If the maintenance message CONTACTOR (10KA) with FCN 121 is shown:
 -
do the trouble shooting procedure (Ref. TS 49400081080800).

 If the maintenance message CONTACTOR (5KA) with FCN 124 is shown:

 -
do the trouble shooting procedure (Ref. TS 49400081080700).

-The SYSTEM REPORT/TEST page comesinto view.
 A. Put the aircraft back to its initial configuration.
 (1)
 On the MCDU, push the line key adjacent to the RETURN indication until the CFDS menu page comes into view.

 (2)
 On the overhead panel, push the APU MASTER/SW to OFF.

 (3)
 De-energize the aircraft electrical circuits
 (Ref. TASK 24-41-00-862-002)

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-40-00Page 503 201-210, Aug 01/05
 CES

 IGNITION - DESCRIPTION AND OPERATION
____________________________________

R **ON A/C 001-003, 051-099, 401-499,
 1.
 General

_______ The ignition system gives the constant high-energy ignition which ignites the fuel/air mixture in the combustion chamber. It operates during the start sequence when the APU speed is between 7 % and 95 %. The Electronic Control Box (ECB) controls the ignition system fully automatically.

 2.
 Component Location

__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
 | | | | DOOR | REF. -------------------------------------------------------------------------------P10 IGNITION UNIT 315/ 315AL 49-41-38
 316 316AR IGNITER PLUG 315/ 315AL 49-41-41 316 316AR ELECTRICAL LEAD - IGNITER PLUG 315/ 315AL 49-41-43 316 316AR
 3. System Description
__________________ (Ref. Fig. 001, 002) The ignition system ignites the fuel/air mixture in the combustion chamber of the APU during the start sequence. The main components are:
 -
an ignition unit,

 -
an igniter plug,

 -
an igniter plug electrical-lead. The ignition unit is a completely self contained unit, installed on the lower right side of the APU. This ignition unit produces the electrical energy that is needed to ignite the fuel-air mixture in the combustion chamber. An electrical lead delivers the electrical energy to an igniter plug, screwed into the combustion chamber. The ECB switches off the ignition unit when the combustion flame can support itself. The high efficiency components of the ignition system guarantee a minimum ignition spark energy of 1 joule. This is regulated to a spark rate of 2 to 10 sparks per second. The nominal stored energy of the ignition unit is 4 joules with a high-voltage of 18 KV. The system components are sealed to minimize the possibility of any contact with flammable fluid or vapours in the APU compartment.

 Ignition System - Component Location
 Figure 001

 CES

 Ignition System - Schematic
 Figure 002

 CES

 4. Component Description_____________________ (Ref. Fig. 001)
 A. Ignition Unit The ignition unit is installed inside a tin-plated aluminum box that is hermetically sealed. This protects the components inside the box against the environmental effects of moisture and altitude. The ignition unit is shop-repairable only.
 B. Igniter Plug Electrical-Lead The electrical lead is made up of a Teflon-insulated center conductor, shielded with a copper inner braid. This is covered with a convoluted flexible tube of spirally wound nickel-iron alloy. The electrical lead is installed between the ignition unit and the igniter at the left side of the the APU.
 C. Igniter Plug The igniter plug is made up of an electrode, an insulator and a two-piece outer shell. The electrode is made of tungsten-alloy and the insulator is made of aluminum-alloy. The outer shell is made of stainless steel and has a Hastelloy X-tip welded to the high temperature end. Nickel washers and glass-bead seal the igniter from the through-flow of combustion gasses. The nickel washers are installed between the insulator and the outer shell. The glass bead is fused to the insulator and the center electrode at the base of the connector area for the electrical lead.
　
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