Oxygen System

Question 1

How is aircraft’s oxygen supply stored?

Answer 1

 A 25 & 75 liter converter
 The converters are installed in an enclosed compartment in the left main landing gear pod fairing between the two main bogies

Question 2

How does the O2 warning system work?

Answer 2

 CABIN PRESS LOW LIGHT comes on at 10,000 ft cabin pressure
 If cabin pressure goes to 12,500 to 14,000, you get:
o OXYGEN ON light on the continuous flow regulator panel comes on
o All relief crew, courier, troop and cargo white dome lights on bright
o All NO SMOKING lights come on
o The warning horns sound in the plane
o Masks drop automatically: mask storage container doors open automatically in the relief crew, courier and troop compartments, and in the troop compartment lavatories
o O2 continues to flow until cabin altitude resets below 11,500 feet

Question 3

Where is the O2 warning horn silence button?

Answer 3

Copilots overhead panel

Question 4

How many portable O2 bottles are there? Where are they?

Answer 4

16

One bottle and mask is located at: (10 bottles)
 Fwd side of engineer’s table
 Fwd side of navigator’s work table
 Across aisle from flight station ladder
 Aisle between bunk compartment doors
 Across from flight deck service door
 Aft right side of troop compartment
 Aft right side of troop next to LM outboard seat
 Crew lavatory
 Fwd troop compartment lavatory
 Aft troop compartment lavatory

Two bottles and masks are located at: (6 bottles)
 Fwd left and right side of cargo compartment
 Center left and right side of cargo compartment
 Left and right side of cargo compartment forward of troop doors

Question 5

How many O2 rechargers are on the plane? Where are they?

Answer 5

10
 Fwd side of engineer’s table
 Fwd side of navigator’s work table
 Across aisle from flight station ladder
 Across from flight deck service door
 Aft right side of troop compartment
 Crew lavatory
 Aft troop compartment lavatory
 Crew entrance door (next to portable O2 bottle)
 Center-right cargo compartment (next to right-hand bottle)
 Left troop door (next to left portable O2 bottle)

Question 6

How many AERP chem gear mounting brackets are on the plane? Where?

Answer 6

 Pilot and observer, kit bag area (2)
 Copilot, kit bag area (1)
 Flight engineer, left side of table (1)
 Navigator, left back corner of table top (1)
 Relief crew compartment, right and left fwd bulkhead (2)
 Fwd troop/courier compartment, right fwd bulkhead (1)
 Aft troop compartment floor in front of LM seats (2)

Question 7

What are the O2 pressure limits for the quick don masks?

Answer 7

 275 – 450 static

 275 – 400 flow

Question 8

Each crewmember shall use supplemental O2 anytime the cabin altitude exceeds?

Answer 8

10,000 ft

Question 9

Without supplemental O2, altitude and flight time are limited to 3 hours and ___ feet.

Answer 9

13,000 feet