TB 1-1520-238-20-30
(c) Remove wire from terminal 3. Using a multimeter, check from this removed wire to ground for
continuity.
(d) If steps 9c(3)(b) and 9c(3)(c) checks arc confirmed, thcn the wires were attached crosswircd.
Reverse and reattach these wires. Retest for 28 volts at discrepant P511 connector(s) pin by repeating the inspection
procedure. If 28 volts is still present as a rcsult of retest, Procccd to para 9c.
(c) If steps 9c(3)(b) and (c(3)(c) checks indicate the wire from terminal 5A does not have continuity to ground and
the wire from terminal 3 does not have continuity to ground, leave wiring disconnected and proceed to para 9c.
d. Correction Procedure for plower at pins EE and/or FF.
(1) Remove aircraft power.
(2) Remove wing access cover(s) LW8, LW7, RW7 AND RW8 (TM 55-1520-238-23, para 2-2-5) of discrepant
pylon(s) found in the inspection procedure of para 8.
(3) Locate respective discrepant pylon(s) RCCB CB201, 202, 203 and/or 204 per TM 55-1520-23P, Figure
472, item 3. This Figure locates RCCB's for any one of the four pylons. Perform the following for each discrepant
pylon.
(a) Remove wire from terminal 5A of RCCB. Using a multimeter, check from the removed wire to
ground for an open circuit.
(b) Remove wire from terminal 3. Using a multimeter, check from this removed wire to ground for
continuity.
(c) If steps 9d(3)(a) and 9d(3)(b) checks arc confirmed, then the wires were alttached crosswired.
Reverse and reattach wires. Retest for 28 volt at discrepant P511 connector pin(s) by repeating the inspection pro-
cedure.
(d)If steps 9d(3)(a) and 9d(3)(b) checks indicate the wire from terminal 5A does have continuity to
ground and the wire from terminal 3 does not have continuity to ground, leave wiring disconnected to the discrepant
RCCB and procced to para 9c.
c. Corrective Procedures For Possible Defective RCCB's and/or Electromagnetic Relays.
(1) Ensure aircraft power is removed.
(2) Using a multimeter, check continuity between terminals A1 and A2 of suspect circuit breaker(s) (RCCB
CB3 201, 202, 203 and/or 204). Shorted terminals require replacement of applicable circuit breaker. Open ter-
minals require replacement of related relay.
NOTE
The K 1-5 relay controls power at pins AA, and the K2-5/6 relay
controls power at at pins EE/FF. The K1-5 and K2-5/6 relays are
located in TM 55-1520-238-23P, Figure 380, items 1 and 2 respec-
tivcly.
(3) Replace discrepant relays per TM 55-1520-238-23, para 9-8-35.
(4) Reconnect all wires to their respective CB terminals (5A and 3).
(5) Repeat inspection procedure, para 8.
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