TM 55-1520-240-T
9-2.4
AC POWER SYSTEM OPERATIONAL CHECK (Continued)
9-2.4
TASK
RESULT
3.
Set BATT switch (9) to ON.
MASTER CAUTION lights (10) shall come on. If lights do
not come on, go to task 9-1.4.
4.
Have pilot start apu.
APU ON capsule (11) shall come on.
5.
Set APU GEN switch (12) to ON.
NO. 1 RECT OFF and NO. 2 RECT OFF (Without 74)
RECT 1 and RECT 2 (With 74) capsules (13 and 14)
shall go out. If both capsules are on, go to task 9-2.5. If
either capsule is on, go to task 9-1.8 or 9-1.9.
6.
Check that GEN NO. 1 and NO. 2 switches (15 and 16)
If either switch (15 or 16) is not at OFF, then set it to OFF.
are at OFF.
7.
Check that NO. 1 GEN OFF and NO. 2 GEN OFF
If either capsule (17 or 18) is out, go to task 9-2.6.
(Without 74) GEN 1 and GEN 2 (With 74) capsules
(17 and 18) are ON.
8.
Have pilot start engines and establish 100% rotor rpm.
9.
Set GEN NO. 1 switch (15) to TEST.
NO. 1 GEN OFF (Without 74) GEN 1 (With 74) capsule
(17) shall go out. If it does not, check ground stud GD100
(STA 594, WL 76, LBL 10), for security and good bond to
structure. If capsule (17) still does not go out, go task
9-2.7.
10.
Set GEN NO. 1 switch (15) to ON.
NO. 1 GEN OFF (Without 74) GEN 1 (With 74)capsule
(17) shall stay out. NO. 1 RECT OFF NO. 2 RECT OFF
(Without 74) RECT 1 and RECT 2 (With 74) capsules
(13 and 14) shall stay out. If capsule (17) comes on and
stays on, go to task 9-2.8.
11. Have pilot shutdown apu.
APU ON capsule (11) shall go out. NO. 1 RECT OFF and
NO. 2 RECT OFF (Without 74) RECT 1 and RECT 2
(With 74) capsules (13 and 14) shall stay out. If they
come on, go to task 9-2.9.
GO TO NEXT PAGE
Change 19 9-65
