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Oxygen System

G500 Systems

The oxygen system is similar to previous versions but more fool proof. The primary switch is guard on, for example.

Work in progress


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Photo: Eddie's notes on oxygen

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How it works . . .

Operation

System Test

The components in greater detail . . .

Crew Masks

Crew Masks Stowage Box

Oxygen Bottles

Passenger Oxygen Masks

Panels

Portable Oxygen Bottles

Protective Breathing Equipment (PBE)

Limitations and Abnormal Procedures . . .

Limitations


How it works . . .


Operation

Work in progress

System Test

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Photo: G500 Passenger oxygen system test, PAS, p. 12-15

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[PAS, p. 12-15] Passenger Oxygen System Test

  • Master Test switch on DU Ctrl / Test page. Press and release. Test latches until de-selected. When selected, O2 annunciator lights illuminate, therapeutic cyan on, ALT SELECT amber HIGH ALT, and the Pax O2 shown below.

  • Passenger Oxygen O2 test switch: accessed via DU Ctrl / Test → System Test. Press and hold: passenger Oxygen O2 test switch → Green, passenger Oxygen On. 2 aural CAS bongs, 2 Master Warning “CAUT” lights. PASS OXYGEN ON light → Rt Side console, NO SMOKING signs / icons illuminate, aural doorbell chime over speakers if NO SMOKING switch not selected ON. Test ends when switch released.


The components in greater detail . . .


Crew Masks

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Photo: G500 Crew masks, PAS, p. 12-5

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[PAS, p. 12-5]

  • There are three crew masks (pilot, copilot, and jump seat) that are quick donning (capable of donning and sealing within 5 seconds).

  • Each mask contains an inflation harness that is activated by squeezing both red tabs together. This inflates the harness for placement over head. When tabs are released, harness deflates and conforms to head and tension secures mask against face.

  • The comfort control is a gray, 2-stop button on front of mask. When pressed to first stop, the harness inflates slowly. Release the button when at desired comfort level. When pressed to the second stop the harness will deflate.

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Photo: G500 G500 Crew masks, PAS, p. 12-6

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[PAS, p. 12-6]

  • The mask microphone is integrated into breathing area of mask and is activated by selecting MASK on COMM JACKS panel. This activates cockpit overhead speakers and the mic is keyed with Push-To-Talk on sidestick or CCD.

  • The N / 100% control switch on mask / regulator allows for selection of:

    • Pull OUT → “N” (Normal) → Diluted O2 (regulated by altitude and demand; pressurized 100% O2 supplied at 35K’ cabin altitude)

    • Press IN → 100% O2 (100% O2 supplied at all altitudes, manufacturer recommends to keep in this setting)

  • EMERGENCY / PRESS TO TEST knob (3 functions)

    • Pressed IN momentarily: Verifies if regulator can supply constant pressure O2; Used in conjunction with PRESS-TO TEST switch on storage compartment for Oxygen System preflight test

    • NORMAL setting (fully counterclockwise position): Allows regulator to provide diluter-demand flow

    • EMERGENCY setting (fully clockwise position): Provides constant pressure 100% O2 if N / 100% switch is in 100%

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Photo: G500 Crew masks, PAS, p. 12-7

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[PAS, p. 12-7]

  • There are three smoke goggles, one each under the front of each pilot's seats and one for the jump seat in a storage box in the floor just aft of center pedestal.

  • Remove the goggles from their holders and attach to masks: place goggles locking mechanism in front of receptacle on mask and push into receptacle until it clicks locked.

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Photo: G500 Crew masks, PAS, p. 12-8

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Photo: G500 Crew masks, PAS, p. 12-9

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[PAS, p. 12-9]

  • The flow blinker indicates oxygen flow when yellow, no flow when black.

  • The PRESS-TO-TEST AND RESET control switch may be used while the mask is in the stowed position. The flow blinker displays yellow momentarily then turns black indicating leak-tight. If blinker remains yellow, suspect a leak and investigate.

  • The RESET position closes the shutoff valve to stop oxygen flow. The shutoff valve opens when compartment doors open.

  • To remove mask from storage compartment, grasp mask by red tabs, quickly pull mask from compartment. This will inflate the harness and activates the flow of oxygen to the mask.

Crew Masks Stowage Box

Work in progress

Oxygen Bottles

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Photo: G500 Oxygen bottles, PAS, p. 12-3

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[PAS, p. 12-3]

  • There are two oxygen Bottles located under the main cabin floor near the vestibule area. The bottles are identical and interchangeable. Capacity is 123.4 cubic ft, pressure is 1800 ± 50 psi.

  • The bottles are rupture resistant, manufactured from seamless aluminum, wrapped in Kevlar fabric.

  • Each bottle is equipped with a shutoff valve and a low pressure regulator on the neck of each bottle to maintains a nominal delivery pressure of 55 to 80 psi.

  • There is a direct reading gauge at the O2 service panel. High pressure relief valve rated at 2775 maximum psi. A low pressure relief valve alerts crew when low pressure O2 < 45 psi:

    • Crew Oxygen Off

    • Passenger Oxygen Off

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Photo: G500 Oxygen service panel, PAS, p. 12-4

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[PAS, p. 12-4]

  • The Oxygen Service Panel is located on the right side of the aircraft opposite main door.

  • The Oxygen High Pressure Relief Disc is located just forward of service panel. A green disc that caps overboard discharge line. Crew or passenger O2 vented here to relieve pressure due to over pressure (regulated pressure > 90 psi, O2 bottle pressure > 2500-2775 psi. Vented O2 will blow out green disc to alerts crew during preflight of O2 discharged overboard.

Panels

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Photo: G500 Oxygen system panel, PAS, p. 12-12

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[PAS, p. 12-12] Oxygen System Panel

  • Located on copilot side console.

  • CREW / PASS guarded green toggle switch does not require electrical power. When ON, O2 flow provided to Crew / Pax O2 system. Normally left in ON position after aircraft shutdown. When OFF, O2 flow to system is inhibited.

  • THERAPEUTIC OXYGEN guarded switch is normally OFF (dark). When ON (Blue), allows flow of O2 to therapeutic port in cabin. CAS message: Therapeutic Oxygen On.

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Photo: G500 Passenger oxygen panel, PAS, p. 12-13

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[PAS, p. 12-13] Passenger Oxygen Panel

  • PASSENGER OXYGEN rotary knob, 3 position rotary knob, does not require electrical power

    • AUTO (normal position), enables auto deployment of pax O2 masks, dependent upon ALT SELECT switch setting. Flow of O2 to masks regulated based on cabin altitude.

    • OFF: Inhibits flow of O2 to pax O2 system.

    • MAN: Manually deploys pax O2 masks, O2 flows to masks at a constant preset flow.

  • Green PASS OXYGEN ON indicator light: normally dark, indicates green when flow of O2 to pax masks is sensed. CAS message: Passenger Oxygen On.

  • OXYGEN SUPPLY PRESSURE gauge: does not require electrical power, displays O2 supply pressure available to crew and pax. Shows the regulated pressure after leaving O2 bottles. Actual pressure in O2 bottles can be read via TSCs and synoptic pages.

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Photo: G500 Boom / Mask Mic Switch, PAS, p. 12-14

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[PAS, p. 12-14]

  • ALT SELECT guarded switch requires PASSENGER OXYGEN switch AUTO. OFF (dark) → Out position (normal position), Pax O2 masks auto deploy → Cabin alt 14,750' +/- 250'. Amber “HIGH ALT” → IN position, used when flying in / out of airport elevation > 14,000', Pax O2 masks auto deploy → Cabin alt 15,750' +/- 250'

  • ALT TEST port → Used for MX testing of Pax O2 masks deploy

  • Boom / Mask Mic Switch located on left and right COMM JACKS panels. When selected to MASK, activates O2 mask mic, activates cockpit overhead speakers. Mic is keyed with Push-To-Talk on sidestick or CCD. Jump seat uses RADIO / ICS toggle switch on its COMM JACKS panel.

Passenger Oxygen Masks

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Photo: G500 Passenger masks, PAS, p. 12-10

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[PAS, p. 12-10] Passenger Overhead Masks

  • Yellow cup-like masks commonly used in airline operations. The number installed must exceed number of occupants by at least 10%.

  • Located in compartments overhead each seat, lavatories, and galley.

  • Deployed automatically by cabin depressurization or manually from a switch on cockpit oxygen control panel.

  • The passenger must pull on a lanyard to remove a flow pin, which allows a low flow O2 to flow into retaining bag.

[PAS, p. 12-10] Therapeutic Mask

  • An outlet is installed in the cabin, usually near the divan. The mask and hose provided for medical emergencies are normally stowed in a divan storage compartment.

Portable Oxygen Bottles

Work in progress

Protective Breathing Equipment (PBE)

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Photo: G500 PBE, PAS, p. 12-11

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[PAS, p. 12-11]

  • There are two, one in the cockpit behind pilot's seat and one in the cabin in the aft lav cabinet in wall above the toilet seat.

  • The PBE is designed to safeguard wearer from effects of smoke, CO2, harmful gases, and O2 deficiency. Helps to manage inflight fires, smoke or fume emergencies, improves visibility in smoke filled compartments, protects head / face from melting / dripping plastics, shields head against brief exposure to heat / flame.

  • Contains 2 oxygen cylinders which combined to hold a minimum of 36 liters of oxygen.

  • Battery powered Service / End-of-Service Indicator light, mounted slightly below eye level on left inner side of hood. Green → Equipment functioning properly. Red → Service life has ended.

  • O2 remains in hood for full 15 mins of total usage time.

  • Preflight requirement: replace PBE if beyond usability date or humidity indicator → Pink. (Normal → Blue)


Limitations


Limitations

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Photo: Oxygen duration, crew of three, masks on NORMAL, AFM, §01-35-10, fig. 1

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Photo: Oxygen duration, crew of three, masks on 100%, AFM, §01-35-10, fig. 2

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[AFM, §01-35-20]

  • PASSENGER MASKS ARE INTENDED FOR USE DURING AN EMERGENCY DESCENT TO AN ALTITUDE NOT REQUIRING SUPPLEMENTAL OXYGEN.

  • PASSENGER MASKS DO NOT PROVIDE SUFFICIENT OXYGEN FOR PROLONGED OPERATION ABOVE 34,000 FEET CABIN ALTITUDE.

  • PROLONGED OPERATION ABOVE 25,000 FEET CABIN ALTITUDE WITH PASSENGERS ABOARD IS NOT RECOMMENDED.

  • Above Flight Level 250, crew masks must be in the quick-donning position which allows donning within 5 seconds.

  • Crew and passenger oxygen masks are not approved for use at greater than 40,000 feet cabin altitude.

References

Gulfstream GVII-G500 Airplane Flight Manual, Revision 1, August 31, 2018

Gulfstream GVII-G500 Production Aircraft Systems, Revision 1, Oct 1, 2018

Revision: 20190601
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