Table 2 Master Maintenance Plan Task List
Task number
Item Name
Task Description
Interval
Data Module Refer-
ence
*21-30/469
MSN 1720-9999 -
Cabin pressurization
high cabin altitude
warning
Functional test
4,800 FH / 48 Months 12-B-21-30-00-00A-
21-40/50
Water separator con-
denser
Clean
1,200 FH / 12 Months 12-B-21-40-03-00A-
21-40/51
Overtemperature
switch
Functional test
4,800 FH / 60 Months 12-B-21-40-06-00A-
21-40/52
Duct overtemperature
switch
Functional test
4,800 FH / 60 Months 12-B-21-60-05-00A-
21-40/55
Cold air unit
Add oil
600 FH
21-40/56
Heat exchanger ma-
trix
Inspection/check
600 FH
21-40/128
Flight compartment
foot heater (if instal-
led) thermal protec-
tion switch
Operational test
1,200 FH / 12 Months 12-B-21-43-00-00A-
21-40/330
Cabin auxiliary heat-
er thermal protection
switch
Operational test
1,200 FH / 12 Months 12-B-21-40-01-00A-
903A-A
12-B-21-40-01-00A-
903B-A
21-40/331
Underfloor heater
thermal protection
switch
Functional test
1,200 FH / 12 Months 12-B-21-40-01-00A-
903A-A
12-B-21-40-01-00A-
903B-A
21-50/58
Vapor cycle compres-
sor motor (if installed)
Inspection/check
500 Operating hours 12-B-21-50-03-00A-
21-50/59
Vapor cycle compres-
sor motor drive belt (if
installed)
Check for tension
500 Operating hours 12-B-21-50-01-00A-
21-50/223
Vapor cycle cooling
system (if installed)
Examine the cooling
unit
1,200 FH / 12 Months -
21-50/433
Vapor cycle compres-
sor condenser mod-
ule (including motor)
(if installed)
Clean, refer to
OSCMM
Initially at each
scheduled inspection,
then based on field
experience the inter-
val can be adjusted
to a more effective
level
-
21-50/461
Vapor cycle compres-
sor motor (CCM P/N
959.90.22.140, if in-
stalled)
Inspection/check
600 Operating hours 12-B-21-50-03-00A-
PC-12/47E AMM Doc No 02300, ISSUE 01 REVISION 27 MSN 545, 1001-1719, 1721-1942
12-B-AM-00-00-00-I
UNCLASSIFIED
Effectivity: All
12-B-05-40-00-00A-000B-A
UNCLASSIFIED
07.02.2022 Page 15