(3) On the overhead maintenance panel 50VU:

 (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.

 (b) Put a warning notice to tell persons not to energize the FADEC 1(2).

 Subtask 74-21-30-865-058
 B. Open, safety and tag this(these) circuit breaker(s):
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU ENGINE/1 AND 2/IGN/SYS A 1JH A03
 FOR 1000EM1 121VU ENGINE/IGN/ENG1/SYS B 3JH1 P41 121VU ENGINE/IGN/ENG1/SYS A BAT 2JH1 P39
 FOR 1000EM2 121VU ENGINE/IGN/ENG2/SYS B 3JH2 P42 121VU ENGINE/IGN/ENG2/SYS A BAT 2JH2 P40
 Subtask 74-21-30-010-056
 C. Get Access
 (1) Open the fan cowl doors: (Ref. TASK 71-13-00-010-040)
 FOR 1000EM1
 437AL, 438AR
 FOR 1000EM2
 447AL, 448AR

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 D. Make the thrust reverser unserviceable (Ref. TASK 78-30-00-481-041). Subtask 74-21-30-010-057
 E. Open the thrust reverser doors: (Ref. TASK 78-36-00-010-040)
 FOR 1000EM1
 451AL, 452AR
 FOR 1000EM2
 461AL, 462AR

 Subtask 74-21-30-020-053
 F. Remove the spark igniter (Ref. TASK 74-21-30-000-002)
 4. Procedure
_________
 (Ref. Fig. 601/TASK 74-21-30-991-302) Subtask 74-21-30-210-052
 A. Do the inspection of Spark Igniter.
 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
1. Body for :
 - Wear from contact  Any amount, 0.030 in. 
with the combustion  (0.76 mm) deep. No wear 
chamber.  completely through the 
shell is permitted. 
- Wear through the  No wear is through the 
body from internal  body is permitted. 
arcing. 
2. Tip for :
 - Distortion.  Not serviceable. 

Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
Replace the spark igniter (Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
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 Inspection of the spark igniter
 Figure 601/TASK 74-21-30-991-302

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 -------------------------------------------------------------------------------INSPECT/CHECK MAXIMUM REMARKS SERVICEABLE LIMITS -------------------------------------------------------------------------------
- Electrode loose or missing.  Not serviceable.  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
 - Tip electrode height in relation to the shell tip. 0.25 in. (6.35)  max depth below the tip.  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
 - Ceramic material cracked or is missing pieces.  Not serviceable.  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).

 3. Threaded connector end for:

 NOTE : Do a borescope inspection of the high pressure turbine rotor when the
____
 pin electrodes have missing pieces (Ref. TASK 72-52-00-290-001).
 -Dirt/grease in terminal well  Not serviceable  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
 -Ceramic-cracked or missing pieces.  Not serviceable  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002).
 -Arcing or erosion on button contact  Not serviceable  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002)
 -Carbon track on ceramics  Not serviceable  Replace the spark igniter(Ref. TASK 74-21-30-000-002) and (Ref. TASK 74-21-30-400-002)

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