Oxygen

Question 1

LOX Card (TMU-27/M) Service Pressure?

Reference: (MPC 121401.0) P.5

Answer 1

40 (+/- 5) psi

Close service valve when steady stream of LOX flows from purge adapter/overboard vent.

Question 2

LOX Servicing using TMU-27/M

Reference: (MPC 121401.0) P.4

Answer 2

NOTE: If oxygen system has been empty for more than 2 hours and system pressure depleted, O2 system SHALL be purged.

• Front of cart(tow hitch end) is facing towards the aft end of aircraft.
• Control panel positioned perpendicular to servicing port.
• service hose free of bends/kinks.

Question 3

Parking/Storage of LOX Cart?

Reference: (MPC 121401.0) P.3

Answer 3

25’ - Structure w/fire resistant or non-combustible
50’ - Structure w/combustion or smoking area
75’ - Aircraft parked/fueling and defueling area

NOTE: LOX boil-off during storage can be considerably reduced if storage tank is placed so that the rear end is higher than the front end, thus, in effect, elevating the piping.