747-400 AMM 飞机维护手册起落架 LANDING GEAR 1(57)_航空信息_民用航空_通用航空

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(4)
Remove electrical power if it is not necessary (Ref 24-22-00/201).

D.
Do a check to find a defective PSEU circuit card (Optional) (Tables 1-4)

NOTE: You must make a record of the shop faults before you remove the
____
PSEU. This will permit you to find which circuit card is
defective.

S 814-016
(1)
For messages in Table 1 items 1-27, 39-42, 46; Table 2 items 1-2, 5-6, 11, 15-20, 25; do the steps as follows:

(a)
Look for the THIS CPU or the OTHER CPU message at the end of the shop fault message.

(b)
If you see the THIS CPU message, do these steps: 1) Do a check for CMCS present leg faults for 32903 PSEU BUS-A>EIU BUS FAIL 2) Do a check for CMCS present leg faults 32904 PSEU BUS-B>EIU BUS FAIL 3) If CMCS messages 32903 and 32904 do not show, card A01 is

defective 4) If CMCS message 32903 shows, card A14 is defective 5) If CMCS message 32904 shows, card A01 is defective.

(c)
If you see the OTHER CPU message, do these steps: 1) Do a check of the CMCS present leg faults for 32903 PSEU BUS-A>EIU BUS FAIL 2) Do a check of the CMCS present leg faults for 32904 PSEU BUS-B>EIU BUS FAIL 3) If CMCS messages 32903 and 32904 do not show, card A14 is

defective 4) If CMCS message 32903 shows, card A01 is defective 5) If CMCS message 32904 shows, card A14 is defective.
S 814-017
(2)
For all other shop fault messages, do the steps that follow:

(a)
Find the shop fault message in table 1.

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747-400 MAINTENANCE MANUAL
(b) Find the number of the defective circuit card.
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