*[1] If contamination is suspected, do procedure in accordance with Boeing Document D6-24429, An Analytical Method for Contaminants in BMS 3-11 Fluids and Their Mixtures Using Differential IR Spectroscopy.
*[2] Contamination is a quantity that is more than that in the base stock or the group of items which you add. Compare the data from the fluid analysis with the limits put on the new fluid.
*[3] The precision of + 10 ppm is applicable to total values in the range from 0 to 1000 ppm. In the range from 1000 to 3000 ppm, the precision will decrease to + 50 ppm with some equipment.
*[4] These are the maximum contamination limits based on a 100 milliliter sample size.
BMS 3-11 Property Limits Chart 501
29-09-111 Figure 601 May 01/99
Page 602
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
C. Prepare Bottles for Sampling
(1)
Clean polyethylene bottle.
(a)
Prepare solution of detergent and hot water and wash bottle thoroughly.
(b)
Rinse twice in hot soft tap water.
(c)
Rinse twice in double distilled, deionized water.
(d)
Drain and air dry in clean room laminar flow bench.
NOTE: If laminar flow bench is not available, bottle may be placed upside down in a clean dry room. All personnel should be kept from the room until bottle has been dried and capped.
(e)
When bottle is dry, install screw cap and place in new polyethylene bag. Seal bag with knot or tape and identify.
(2)
Clean glass bottle.
(a)
Rinse thoroughly in 20% by volume nitric acid.
(b)
Rinse twice in hot, soft tap water.
(c)
Rinse twice in distilled water.
(d)
Rinse isopropyl alcohol filtered through Gelman Type GA-6 membrane.
(e)
Rinse with petroleum ether filtered through Millipore NR filter.
(f)
Drain and air dry in clean room laminar flow bench.
NOTE: If laminar flow bench is not available, bottle may be placed upside down in a clean dry room. All personnel should be kept from room until bottle has been dried and capped.
(g)
When bottle is dry, install screw cap and place in new polyethylene bag. Seal bag with knot or tape and identify.
502
Feb 15/77 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 29-09-111 Page 603
D. Obtain Fluid Sample
(1)
Depressurize hydraulic reservoirs.
(2)
Open system interconnect valve.
(3)
Provide electrical power.
(4)
Operate both system B hydraulic pumps (Ref 29-12-0, Maintenance Practices).
(5)
Place all A and B flight control and spoiler switches to ON position. Cycle all systems several times to circulate fluid through system.
(6)
Engage yaw damper, aileron and elevator autopilot switches.
(7)
Cycle flaps through a minimum of two complete cycles.
(8)
With pumps operating, open system A reservoir drain valve and drain 1/2 to 1 gallon of fluid into waste container. Then from same valve and without closing, obtain sample in cleaned bottle.
CAUTION: SAMPLING BOTTLE SHOULD BE REMOVED FROM STREAM SO THATVALVE CLOSING WILL NOT DISLODGE CONTAMINANTS AND INFLUENCE SAMPLE.
(9)
Place cap on bottle.
(10)
Close drain valve and lockwire.
(11)
Service hydraulic reservoirs (Ref 12-12-0, Hydraulic - Servicing).
501
29-09-111 Page 604 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 01/74
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