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Downlock Pins Installation, TASK 32-00-01-480-801.
SUBTASK 27-09-61-860-001
(2) Make sure hydraulic power is not supplied to systems A and B. If it is necessary, do this task:
Hydraulic System A or B Power Removal, TASK 29-11-00-860-805.
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SUBTASK 27-09-61-860-002
(3) Do this task: Hydraulic Reservoirs Depressurization, TASK 29-11-01-860-802 or Hydraulic
Reservoirs Depressurization, TASK 29-09-00-860-802.
SUBTASK 27-09-61-860-004
(4) Open this circuit breaker and install safety tag:
F/O Electrical System Panel, P6-3
Row Col Number Name
E 14 C00316 INDICATOR MASTER DIM SECT 4
SUBTASK 27-09-61-020-001
(5) Disconnect the electrical connector [4] from the pressure switch [3].
SUBTASK 27-09-61-020-002
(6) Remove the pressure switch [3]:
(a) Use a 5 gallon (19 liters) hydraulic fluid resistant container, STD-1110 to catch hydraulic
fluid that drains from the pressure switch [3].
(b) Remove the pressure switch [3] from the hydraulic module [5]. Discard the removed
packing.
(c) Put a cover on the hydraulic module housing to keep unwanted material out of the open
port.
------------------------- END OF TASK ---------------------------
TASK 27-09-61-400-801
3. Low Pressure Warning Switch Installation
(Figure 401)
A. References
Reference Title
12-12-00-610-801 Hydraulic Reservoir Servicing (P/B 301)
27-09-61-700-801 Low Pressure Warning Switch Test (P/B 501)
SWPM 20-60-03 Standard Wiring Practices Manual
B. Consumable Materials
Reference Description Specification
D00054 Fluid - Hydraulic Assembly Lubricant - MCS 352B
(Formally Monsanto MCS 352B)
D00153 Fluid - Hydraulic, Erosion Arresting, Fire Resistant BMS3-11, Type
IV
(interchange~
able&
intermixable
with Type V)
G01912 Lockwire - Monel (0.032 In. Dia.) NASM20995N~
C32
(QQ-N-281)
G50171 Compound - Corrosion Inhibiting Compound,
Interior Application - D5026NS or ZC-026
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C. Location Zones
Zone Area
133 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Left
134 Main Landing Gear Wheel Well, Body Station 663.75 to Body Station
727.00 - Right
211 Flight Compartment - Left
212 Flight Compartment - Right
D. Low Pressure Warning Switch Installation
SUBTASK 27-09-61-420-001
(1) If they are not installed, install the backup rings [1] and the packing [2] on the pressure switch
[3].
(a) Apply MCS 352B fluid, D00054 (recommended) or fluid, D00153 (alternative) to the backup
rings [1] and new packing [2].
(b) Put the backup rings [1] and new packing [2] in their position on the pressure switch [3].
SUBTASK 27-09-61-420-002
(2) Install the pressure switch [3]:
(a) Install the pressure switch [3] on the hydraulic module [5].
(b) Tighten the pressure switch [3] to 50-200 pound-inches (5.6-22.6 newton-meters).
(c) Install a lockwire, G01912 on the pressure switch [3] and the nearest bolt.
SUBTASK 27-09-61-420-003
(3) Do the following steps to connect the electrical connector [4]:
(a) Before you connect the electrical connector [4], examine the connector for corrosion.
WARNING: DO THE STEPS BELOW IF THE AIRPLANE OPERATES AT AIRPORTS WHERE
DEICING FLUID THAT CONTAIN POTASSIUM FORMATE IS USED. ALSO DO THE
STEPS FOR ALL AIRPLANES THAT YOU FOUND CORROSION IN THE
ELECTRICAL CONNECTORS IN THE MAIN WHEEL WELL. THE ELECTRICAL
CONNECTOR IS PART OF A SYSTEM THAT IS NECESSARY FOR SAFE FLIGHT.
(b) If there was corrosion, refer to (SWPM 20-60-03) to correct the problem.
(c) Apply the D5026NS or ZC-026 compound, G50171 to the connector (SWPM 20-60-03).
(d) Connect the electrical connector [4] to the pressure switch [3].
E. Put the Airplane Back to Its Usual Condition
SUBTASK 27-09-61-860-005
(1) Remove the safety tag and close this circuit breaker:
F/O Electrical System Panel, P6-3
Row Col Number Name
E 14 C00316 INDICATOR MASTER DIM SECT 4
SUBTASK 27-09-61-610-001
(2) If servicing is necessary for hydraulic system A and B reservoirs, do this task: Hydraulic
Reservoir Servicing, TASK 12-12-00-610-801.
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