Starting System
Left Start PC Board (NZ011)

Location - The PC board is located inside the aft power junction box in the tailcone.  Plug JZ011 is connected to the PC board.  Open Access panel  311AZ , remove the junction box cover, and remove the left PC module enclosure lid to access the PC board.

View of aft power junction box

1.  Left Start PC Board (NZ011)
2.  Right Start Board (NZ010)

Operation - The left start PC board controls the operation of the Left Start Relay (KZ007).  The PC board receives inputs from the Left Generator Control Unit (BT001), the L ENGINE START Switch/Light (SI032), and START DISG Switch/Light (SI033).

Pins

Functions

3

Start command output to the left generator control unit.
4

Start command input from the left generator control unit. 
6

Output to engage the left start relay.
7

Ground on ground input
10

Start control input from the left generator control unit. 
11

Disengage command from START DISG switch/light.
18

Power input from the Left Starter/Generator (SG1).
19

Power input from the LH START CONTROL PCB ASSY Circuit Breaker (HT050).
21 and22

Input from Ground Fault Transformers (UT005 and UZ005)
23

Start command from L ENGINE START switch/light.