IPAS Flashcards
IPAS Users
Fuel (19+/-3 boost/xfer pump)
ECS - heat
Defog
NIU - cools dries and removes o2 for fuel cells
ATS - until 52% NG when eng is self sustaining
Ice detector - 100kts
Louvers - firewall
Hydraulics - high pressure 31+/-3 (prevents cavitation)
Utility receptacle - air pwrd tools
NITROGEN INERTING UNIT
The NIU reduces fire hazards by filling the ullages (airspace) with oxygen depleted air.
Primary source of IPAS air
Dual ENG Bleed Air (50% each, 1 ENG is capable of 100% IPAS)
Secondary Source of IPAS air
Single ENG Bleed Air
ATS
a. Converts pneumatic energy to shaft power for starting/motoring ENG
b. 52% Ng, ATS shuts off and ignition is terminated
c. PRSOV - controls IPAS air as commanded by MP, informs of ATS faults
APU Load Control Valve
The load control valve allows APU bleed air into the IPAS manifold after the APU reaches 95% speed.
Environmental Control System (ECS)
The ECS uses IPAS air for heating the crewstations and the Air Particle Separator (APS). Additionally, pressurized IPAS air is routed to each crewstation through the canopy defog shutoff valve to defog the side windows.
Fuel System Components
(a) The fuel system pressure regulator valve reduces the IPAS pressure down to 19 ± 3 psig for use by:
1) Fuel Boost Pump
2) Fuel Transfer Pump
Ice Detector Probe
The IPAS supplies pressurized air to an outlet aft of the ice detector probe to create a constant airflow past the ice detector probe (100 kts true air speed) by inducing a low-pressure area aft of the probe.
Engine Firewall Louver
The IPAS supplies pressurized air to the engine louver actuator to close the engine louvers when the engine fire extinguishing system is activated from the cockpit. The louvers also designed to cool the engine and transmission.
Utility Receptacle
The utility air receptacle provides a connection to the IPAS for troubleshooting and for air pressure to operate air-powered tools.
Canopy Defog
The canopy defog system prevents or removes moisture (fogging) on the inside canopy side panels of both crewstations. Defogging is accomplished by mixing Integrated Pressurized Air System (IPAS) air with crewstation conditioned air and directing it against the four canopy side panels
IPAS High Pressure Users
Hydraulics
Primary and Utility Hydraulic Reservoir Pressure Regulators
The hydraulic reservoir pressure regulators are factory calibrated to reduce high-pressure bleed air to 31 ± 3 psig for the primary and utility hydraulic reservoirs.
IPAS Ground Operations
a. APU supply bleed air until ENG are running and APU shutdown
b. AGPU when APU/ENG is not possible, required, or desired
