Honda Aircraft Company
HA-420
SYSTEMS
POM
DESCRIPTION
HJ1-29000-005-001
October 30, 2016
1-144
Message
Description
ECS GND COOLING MODE
Ground cooling mode has been
selected
PRESSURIZATION
The cabin pressurization control system (CPCS) is comprised of the
following: a Primary Outflow Valve (POFV), Secondary Outflow Valve
(SOFV), a Cabin Pressurization Data Unit (CPDU), and pneumatic tube
assemblies.
Primary Outflow Valve
The Primary Outflow Valve (POFV) incorporates an Electronic Control
Unit (ECU), mechanical cabin altitude regulator, cabin altitude limiter,
cabin differential pressure limiter, and negative differential pressure
relief function.
The POFV ECU provides pressurization data to the aircraft avionics
system, including cabin pressure altitude, cabin pressure altitude rate,
and cabin differential pressure.
Secondary Outflow Valve
The SOFV opens and closes along with the POFV. Similar to the POFV,
the SOFV also incorporates a mechanical cabin altitude limiter, a cabin
differential pressure limiter, and a negative differential pressure relief
function that are all independent of the POFV. There are no electrical
components in the SOFV.
Limiters
In the event of a malfunction of the CPCS, the cabin altitude will be
maintained at 13,500 ±500 feet via independent mechanical cabin
altitude limiters on each OFV.
FOR TRAINING PURPOSES ONLY
