Table 2 Master Maintenance Plan Task List (Continued from previous page)
Task number
Item Name
Task Description
Interval
Data Module Refer-
ence
*21-20/317
ECS emergency
shut-off system
Attach a spring bal-
ance to the ECS
EMER SHUT-OFF
lever. Pull the lev-
er and check that
the max pull force
to open the ram air
scoop is 100 N (22.5
lbf) and make sure
that the ram air scoop
is completely open
3,000 FH / 12 Months
See Note 2
-
21-30/46
MSN 1001-1719 -
Cabin positive pres-
sure relief
Functional test
4,800 FH / 48 Months 12-B-21-30-00-00A-
903A-A
21-30/314
Cabin pressurization
positive pressure re-
lief valve
Check for contamina-
tion of the valve pop-
pet and poppet seat.
If contamination is
found remove and
clean
2,400 FH / 24 Months 12-B-21-30-02-00A-
250A-A
*21-30/318
MSN 1001-1719 -
Pressurization dump
switch
Operational test
3,000 FH / 12 Months
See Note 2
12-B-21-30-00-00A-
903A-A
*21-30/463
MSN 1720-9999 -
Cabin pressurization
dump control
Operational test
600 FH / 12 Months
See Note 2
12-B-21-30-00-00A-
903B-A
*21-30/464
MSN 1720-9999 -
Cabin pressurization
manual control
Operational test
600 FH / 12 Months
See Note 2
12-B-21-30-00-00A-
903B-A
*21-30/465
MSN 1720-9999 -
Cabin pressurization
positive pressure re-
lief valve
Functional test
4,800 FH / 48 Months 12-B-21-30-00-00A-
903B-A
21-30/466
MSN 1720-9999 -
Cabin pressurization
positive pressure re-
lief valve
Task replaced by
21-30/314
-
-
21-30/467
MSN 1720-9999 -
Cabin pressurization
negative pressure re-
lief valve
Examine
4,800 FH / 48 Months 12-B-21-30-05-00A-
310A-A
*21-30/468
MSN 1720-9999 -
Cabin pressurization
altitude limiting func-
tion
Functional test
4,800 FH / 48 Months 12-B-21-30-00-00A-
903B-A
PC-12/47E AMM Doc No 02300, ISSUE 01 REVISION 26 MSN 545, 1001-1719,
1721-1999
12-B-AM-00-00-00-I
UNCLASSIFIED
Effectivity: All
12-B-05-40-00-00A-000B-A
UNCLASSIFIED
2021-12-04 Page 14