Component Maintenance Manual
EFFECTIVITY: ALL
21-00-22
Page
6004
JULY 21, 2011
Condensate Drain (part of Evaporator Housing Assembly)
Expansion
Valve
8.3.1.1
EVAPORATOR COIL: The evaporator coil fins can, over time, become clogged with
dirt, dust, and other foreign matter. The component can also become damaged. The
coil return bends can, over time, become damaged. Dents, nicks, cracks, and other
damage can cause less than optimal performance. It is essential that the evaporator
coil remain clear and undamaged for proper operation. Refer to Cleaning (Section 6)
for proper cleaning procedures. If coil fins are bent, use a fin comb and try
straightening the fins. If fins are excessively damaged or the return bends are
excessively damaged, the entire evaporator module assembly must be removed and
replaced (refer to aircraft maintenance manual). Contact Pilatus Aircraft Customer
Service for replacement component.
8.3.1.2
EVAPORATOR HOUSING ASSEMBLY: The components that comprise the
evaporator housing assembly are the shroud and escutcheon. Over time, the shroud
and escutcheon may show signs of separating and this can cause the evaporator coil
assembly to have less than optimal performance. After insuring that the seam
between the shroud and escutcheon has been cleaned according to the cleaning
procedures (Section 6), apply a new bead of RTV and smooth. Allow RTV to cure for
a minimum of 24 hours before operating system. If housing assembly is damaged in
any way other than seam separation, the entire assembly must be removed and
replaced (refer to aircraft maintenance manual). Contact Pilatus Aircraft Customer
Service for replacement component.
8.3.1.3
BLOWER ASSEMBLY: The components that comprise the blower assembly are the
blower motor, blower scroll and blower wheel. Over time, these components can
become dirty or damaged causing the assembly to have less than optimal
performance. Occasionally damage will occur to unit that requires repair and/or
replacement. If the blower assembly is damaged or not operating properly, remove
and replace entire evaporator module assembly (refer to aircraft maintenance
manual). Contact Pilatus Aircraft Customer Service for replacement component. If
Pilatus cannot support a replacement for the 1134200-42 (L) /-43 (C,R) evaporator,
contact Enviro Systems for replacement. Replacement evaporator will be 1134200-60
(L)/-61(R)/-63 (C) and is not compatible with older evaporator 1134200-42/-43.
Therefore, if aircraft has evaporator 1134200-42/-43 that has failed (left or right side),
both the left and right side evaporators must be changed. The left and right
evaporators must all be either 1134200-42/-43 or 1134200-60/-61, not a combination
of the two. After completing the removal and installation of the new evaporator
module assembly, perform functional check (Section 3).
8.3.1.4
CONDENSATE DRAIN: The condensate drain (part of the housing assembly) can,
over time, become damaged. It is essential that the drain remains in excellent
condition for proper operation of the evaporator coil assembly. If the condensate drain
is damaged, the entire evaporator module assembly must be removed and replaced
(refer to aircraft maintenance manual). Contact Pilatus Aircraft Customer Service for
replacement component.
