FED-STD-791D
149 " 2.5C
177 " 2.5C
204 " 2.5C
Oil-in temperature
(300 " 5F)
(350 " 5F)
(400 " 5F)
31.
Continue running until the conditions of Table I for the type of test requested have
stabilized.
32. Take at least two separate flow checks of one-minute duration at each of the
three-way valve position on the pressure side of the scavenge pump. Flow rate
should be 600 " 30 mL/min. The hot test oil collected during the flow check should
be poured immediately back into the test oil tank through the fill port and the port
recapped.
33. Continue endurance testing. At the completion of the 100-hour endurance test, the test
bearing is to be restabilized at 121C (250F) oil-in temperature to determine the relative change
in stabilized temperatures compared to the results obtained at the start of the test. 6.6.3 Daily
startup sequence.
1. Update strip chart recorder.
2. Check oil level through visual sight gauge. Add enough oil so that the bottom of the
test oil meniscus is even with the mark that was made in step 3 of procedure 6.6.2.
Open vent drain valve and remove all oil from the vent line.
3. Repeat steps 4 to 23 for startup procedure.
4. Turn on test bearing heater and adjust as necessary to reach 260 "2.5C (500 " 5F)
on the highest reading thermocouple.
5. Continue running until the conditions have stabilized for the type of test being run as
shown in Table I.
6. Make at least two separate flow checks of one-minute duration each at the three-way
valve position on the pressure side of the scavange pump. The measured volume flow
rate should be 600 " 30 mL/min.
6.6.4 Daily running procedure.
1. Monitor the strip chart recorder for maintenance of test temperatures within correct
operating ranges. Monitor gauges and flowmeters as well.
2. Take two samples of test oil (20 and 60 mL) from the three-way valve in the scavenge
line or with an automated system every 10 h (including warmup time along with
endurance time). The first test sample should be fresh test oil before the oil is
introduced into the system. If the 10-hour sampling period happens to fall during a
shutdown period, take the samples just before shutdown or after first reaching type 1,
1-1/2, or 2 test conditions from next startup of rig. Mark each sample:
B.R Test
Test #
Oil Code
Date
Hour of Sample
133
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