Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
HJ1-29000-005-001
October 30, 2016
1-145
Mechanical positive and negative differential pressure limiters in each
outflow valve will limit differential pressure within a safe range.
Cabin Pressurization Data Unit
The Cabin Pressurization Data Unit (CPDU) provides a redundant, and
independent, set of cabin pressure data to the avionics system.
Normal Operation
When the Thrust Levers are advanced for takeoff, the CPCS enters a pre-
pressurization mode in which the CPCS maintains the cabin rate until a
small differential pressure is achieved. If the takeoff is aborted, the
CPCS depressurizes the cabin.
During climb and cruise, the POFV continuously selects a cabin altitude
and altitude rate based on aircraft altitude, Landing Field Elevation
(LFE) and the pressurization schedule. LFE is automatically determined
from the destination airport in the flight plan. LFE can also be manually
entered by selecting the Manual mode on the CDU Pressurization page
and entering the desired value.
FOR TRAINING PURPOSES ONLY
