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Benefits & Features

The PAO liquid cooling skid is a water chilled electric powered ground support unit used to supply chilled air and temperature conditioned MIL-C-87252 Polyalphaolefin (PAO) liquid coolant to the aircraft’s Environmental Control System, for the purpose of servicing and avionics cooling.
The skid has 2 operational modes:

  • “Open Loop” uses the skid’s pumps for re-circulating the PAO fluid through the skid and aircraft.
  • “Closed Loop” uses the aircraft pumps for re-circulating the PAO fluid through the aircraft and skid.

 

PAO Skid Pre-conditioned Air and Liquid

PERFORMANCE FEATURES

Controls

  • Simple, Single Button Operation
  • Fault Monitoring and Diagnosis for Aircraft Protection

Frame Assembly

  • Welded Steel Construction

PAO/Chilled Water System

  • Liquid-To Liquid Heat Exchange
  • PAO Fluid Reservoir Assembly
  • with vacuum pump
  • 3-Way Diverter Valve w/ Actuator
  • Input and Output Valves (manual operation)
  • Flow, Pressure and Temperature Sensors

Chilled Air/Chilled Water System

  • Liquid-To Air Heat Exchange
  • Input and Output Valves (manual operation)
  • Flow, Pressure and Temperature Sensors
  • Chilled Air Blower with Inlet Filter

Hydraulic Fluid System

  • Air-To-Liquid Heat Exchange
  • Hydraulic Fluid Reservoir Assembly

 

 

Technical Information

ENVIRONMENTAL

  • Storage temperature: -65°F to +160°F
  • Storage pressure: 14.7 to 8.3 PSIA (0 to 15,000 feet)
  • Operating temperature: -40°F to +120°F
  • Operating pressure: 14.7 to 11.3 PSIA (0 to 7,000 feet)

AIRCRAFT INTERFACE

  • Conditioned air duct is 30’ of 8”diameter insulated duct, transitioning to 4” diameter for the final 52”, and is terminated with a MS16051 compatible connector, the aircraft termination is compatible with a MS16051 connector (typical for F-16, and F-22).
  • The 30’, 1” diameter PAO liquid supply line is terminated with a quick disconnect connector compatible with an AEROQUIP style 2055, AE89406M. The 30’, 1” diameter PAO return line is terminated with a quick disconnect connector compatible with an AEROQUIP style 2055, AE89407M connector.

CONDITIONED AIR

  •  Ambient conditions: Pressure: 14.7 PSIA
  • Ambient temperature: +120°F
  • Conditions at aircraft: Pressure: 15.4 PSIA (-0.3/+0 PSI) (19.4”wg)
  • Temperature: 50.0° (-2.5/+0)°F
  • Flow: 42.2 PPM

PAO SYSTEM

  • Designed for use with MIL-C-87252 coolant fluid, Hydrolytically stable, dielectric (PAO)

Controls

  • Automatic mode for normal operation
  • Manual mode for maintenance andtroubleshooting of aircraft

Forward and Aft Loop:

  • Cooling capacity: 40kW
  • Temperature regulation: +75 (-5/+5)°F at the aircraft interface
  • Pressure regulation: 195 PSIG (-2/+5 PSI) at the aircraft interface
  • Flow: 206 lbs./min (31 GPM) NOTE: Flow based on 175 PSID aircraft system pressure drop
  • Filtering: PAO supply fluid filtered at 10 microns absolute
  • Coolant reservoir: minimum of 19 gallons deliverable fluid available to service dry aircraft systems, and vacuum pump to remove entrained water.

FACILITY POWER

  • 480-440 Vac, 60 Hz, 3-phase, 100 amp service or 400-360 Vac, 50 Hz, 3-phase, 120 amp service

FACILITY CHILLED WATER SYSTEM REQUIREMENTS

  • Cold Air System: 50 GPM Flow 45°F @ Skid inlet
  • Total System pressure drop: 0.75 PSIG
  • PAO System: 55 GPM Flow 45°F @ Skid inlet
  • Total System pressure drop: 0.75 PSIG

Fault Annunciation

  • Low Water Pressure
  • Low Water Flow
  • High Water Temperature

APPLICABLE DOCUMENTS

Government specifications:

  • MIL-A-8243 Anti-Icing and Deicing-Defrosting fluids
  • MIL-C-85285 Top Coat
  • MIL-C-85570 Cleaning compound, aircraft exterior
  • MIL-C-87252 Coolant fluid, Hydrolytically stble, dielectric (PAO)
  • MIL-D-83411 Deicer/Anti-icer fluid (for runways and taxiways )
  • MIL-F-24385 Fire extinguishing agent, aqueous film-forming foam (AFFF) liquid concentrate, for fresh and sea water.
  • MIL-H-5606 Hydraulic fluid, petroleum base; aircraft, missile and ordinance.
  • MIL-H-83282 Hydraulic fluid, fire resistant, synthetic hydrocarbon base Aircraft, metric, NATO code number H-537
  • MIL-I-46058 Insulating compound, electrical (for coating printed circuit assemblies)
  • MIL-P-116 Preservation, methods of
  • MIL-P-53030 Primer coat
  • MIL-P-85582 Primer coat

 


Weight: 7500 lbs
Size (l x w x h): 168cm x 279cm x 206cm  (66.14in x 109.84in x 81.10in)

 

Information Downloads

Model IES File Spec Sheet
PAO Skid Specs   pdf