Pneumatics And Environmental; Bleed Air Supply System - Honda HondaJet HA-420 Pilots Operating Manual

Honda Aircraft Company
HA-420 SYSTEMS
POM DESCRIPTION

PNEUMATICS AND ENVIRONMENTAL

Bleed air is supplied by each engine high-pressure compressor section
and is used for the environmental system, wing and engine inlet anti-ice,
cockpit window defog, and cabin pressurization.

BLEED AIR SUPPLY SYSTEM

Un-conditioned bleed air is ported from two interconnected engine bleed
ports to the Cowl Anti-Ice Valve (CAIV) and the High Pressure
Regulating Shutoff Valve (HPRSOV).
The CAIV regulates the un-conditioned bleed air pressure to
approximately 25 psig. From the CAIV, the un-conditioned bleed air is
then ported to the engine inlet for ice protection.
The HPRSOV regulates the bleed air pressure to approximately 60 psig.
From the HPRSOV, the bleed air is ported to the engine Pre-Cooler (PC).
A solenoid function on the HPRSOV will close the valve if commanded.
The PC is an air-to-air heat exchanger that functions as the first stage of
bleed air conditioning (cooling). The conditioning results from the use of
engine fan air supplied to the PC through the Fan Air Valve (FAV). The
FAV flow is controlled by the Fan Air Valve Controller (FAVC) which
receives the bleed air temperature from the Fan Air Valve Temperature
Sensor (FAVTS) located downstream of the PC. The FAV regulates the
cold side air flow through the PC to maintain a bleed air temperature
exiting the PC at approximately 400 ºF during non-wing anti-ice
operations and wing anti-ice operations on the ground. During wing
anti-ice operations in flight, the FAV regulates the bleed air temperature
exiting the PC at approximately 550 ºF. The fan air exiting the PC is
exhausted through the fan air outlet. From the PC, the conditioned bleed
air is ported to the Nacelle Pressure Regulating Shutoff Valve
(NPRSOV).
HJ1-29000-005-001
October 30, 2016 1-131
FOR TRAINING PURPOSES ONLY