(1)
You must do the safety steps that follow when lead acid contamination or leakage is found.
(a)
Do not let the acid leakage move to adjacent areas which will not be cleaned.
(b)
In the battery areas, protect the equipment below the batteries with plastic sheets.
(c)
Make sure the area is vented.
(d)
Use protective covers to prevent contamination of adjacent areas with acids or the solution to make the acid neutral.
(e)
You must always wear protective clothing when you clean up acid contamination.
(2)
Do the steps that follow to clean up the battery electrolyte contamination:
(a)
Soak up the excess fluids with a cloth.
(b)
Neutralize the contaminated area with a 20 percent sodium bicarbonate solution.
NOTE: One pound of sodium bicarbonate mixed into one gallon of water will make the necessary solution.
(c)
Apply the solution with a cloth, mop, brush, or sponge.
NOTE: Do not put the sodium bicarbonate solution into the battery.
1) Make sure the solution goes into the contaminated faying surface joints.
NOTE: A pressure application of the solution can be necessary to flush the faying surface joints and some access areas fully.
2) Apply the solution until the bubbling of the acid/solution stops.
NOTE: When the bubbling stops, the acid has become neutral.
a) Let the solution stay on the surface for 5 minutes more after the bubbles stop.
(d) Remove the solution with a mop or sponge.
1) Discard the contaminated cleanup materials into a plastic container.
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5-51-15 Page 202 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Feb 01/95
EXTREME DUST CONDITION - CONDITIONAL INSPECTION
1. Extreme Dust Condition
A. When Extreme Dust Conditions Exist Prior to Flight:
(1) Examine for the following:
(a)
Stabilizer trim and flap screw and mechanism for cleanliness.
(b)
Static vents and pitot tube for cleanliness.
(c)
Engine inlets for dust accumulation.
(d)
PT2 probe for cleanliness.
500
May 15/80 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 5-51-21 Page 201
EXCEEDING DESIGN SPEED, SEVERE TURBULENCE OR BUFFETING,
CONDITION - MAINTENANCE PRACTICES (CONDITIONAL INSPECTION)
1. General
A. The structural examination in this subject is applicable after a severe turbulence or buffeting condition or stalls (beyond initial buffet or stick shaker) or exceeding design speed.
2. Exceeding Design Speed, Severe Turbulence or Buffeting Conditional Inspection
A. Severe Turbulence
(1)
The following general information applies to a severe turbulence condition.
(2)
The following flight vertical load acceleration limits are specified in the FAA Flight Manual, Section I:
(a)
Flaps up .........................................................2.5g to -1.0g
(b)
Flaps down.....................................................2.0g to 0.0g
NOTE: Deleted
(3) The judgment of the pilot shall determine the requirement for structural inspection.
B. Buffeting
(1)
If an unusual maneuver or abnormal or excessive buffeting or vibration is experienced in flight, a structural examination is required.
(2)
After stalls (beyond initial buffet or stick shaker) examine the following:
(a)
Accessible interior structure in fuselage, aft of rear pressure bulkhead, for distortion, cracks, flaking paint and pulled or missing fasteners. Check the following: Fuselage bulkheads and stabilizer attachment fittings at body stations 1088, and 1156, horizontal stabilizer center section hinge fittings, horizontal stabilizer front and rear spar terminal fittings, and stabilizer jackscrew mechanism mount fittings and support structure. Check jackscrew and hinges for evidence of binding.
(b)
Horizontal stabilizer exterior surfaces for evidence of buckling, checking particularly at skin splices for cracking, yielding and pulled or missing fasteners.
NOTE: If any exterior damage is observed, the spars and all accessible internal primary structure in the affected area must be examined for distortion or buckling, cracks, flaking paint and pulled or missing fasteners.
(c)
Elevator and tab external surfaces for cracks, pulled or missing fasteners, and hinge bearings and actuator bearings for evidence of binding.
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