*SEC 3 operation, servicing, and handling Flashcards
The primary purpose of the TMU-70/M is the
servicing of
aircraft liquid oxygen (LOX) converters.
The TMU-70/M consists of three major components:
(1) a fifty gallon dewar storage tank, (2) a fifteen liter dewar transfer tank, and (3) a low loss, closed loop (LLCL) system of transfer lines.
The annular space between the double walls of the
storage tank and internal transfer lines is evacuated to __ microns or lower.
5
The gaseous oxygen vapors vented from the __ tank and the __ are returned to the __ tank for __ and __.
transfer, converter, storage, cool down and retention
parts that come into contact with liquid oxygen must be cleaned using what method
ultrasonic cleaning
type of NDI method used to detect oil on LOX components
ultraviolet light inspection
when repeated lox washing fails, what is the next step
hot nitrogen purge
when evaporative loss rate becomes excessive, what is the next step you should take
pump down the annulus for a period of 8-24hr
when performing the transfer tank fill test, how long should it take for the liquid level gage indicate full
3 min
when performing the moisture test, the dew point should not go beyond what value
48ppm (-55°F)
when performing the evaporation loss rate test, what is the maximum amount of LOX you can lose per day
17lbs
when must liquid oxygen tanks be purged
out of service for 4 months or more
what is the largest solid/fibrous particle allowed for specimen filter
1000/6000 microns
when weighing the specimen filter, what is the max allowable weight
26mg
when performing the transfer tank pressure test, how long does it take to reach 90psi
2 minutes after the PBU valve is opened
when performing the Storage Tank relief valve test, what is the maximum pressure you must avoid going past and why
58psig, the Storage Tank Rupture Disc may rupture
Transfer Tank Rupture Disc ruptures at
106psig
when performing the evaporation loss rate test, how long should the storage tank be left undisturbed
12 hours
type of oxygen used on the TMU-70
MIL-O-27210 (MIL-PRF-27210)
never put the cart on what surface
macadam (blacktop)
