(b)
If no longer required, remove electrical power from airplane.
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Aug 15/79 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 21-52-0 Page 505
D. Ram Air System Drag Test
(1)
General
(a) The ram air system drag test provides a method for checking the integrity of the working mechanical components of the ram air system during operation. The test is accomplished with ram air actuator disconnected from remainder of system therefore does not test actuator operation. For checking the integrity of the actuator accomplish ram air system operation test.
(2)
Equipment and Materials
(a) Spring scale - 0-100-pound capacity
(3)
Prepare to Test Ram Air System Drag
(a)
Check that ram air system is in full open position (deflector fully extended).
(b)
Open RAM MOD circuit breaker.
(c)
Open ram air duct access door.
(d)
Remove ram air actuator electrical connector.
(e)
Disconnect ram air actuator end fitting from torque shaft quadrant arm and secure actuator so end fitting is outside arm clevis.
(4)
Test Ram Air System Drag
(a)
Connect spring scale to quadrant arm actuator bolt hole.
(b)
Exert force on torque shaft quadrant arm (downward and normal to the arm) as required to move ram air system from full open to full closed and check that load on spring scale does not exceed 75 pounds.
(c)
Exert force on torque shaft quadrant arm in opposite direction as required to move ram air system from full closed to full open and check that load on spring scale does not exceed 75 pounds.
(d)
Remove spring scale.
(e)
Connect ram air actuator end fitting to torque shaft quadrant.
(f)
Install ram air actuator electrical connector.
(g)
Close RAM MOD circuit breaker.
(h)
Provide electrical power.
(i)
Push ground sensing test switch and check that deflector moves to streamline position.
(j)
Release ground sensing test switch and check that deflector moves to fully extended position.
(k)
Remove electrical power if no longer required.
(l)
Close ram air duct access door.
21-52-0 Nov 15/79
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
RAM AIR ACTUATOR - REMOVAL/INSTALLATION
1. General
A. Prior to actuator attachment to the torque shaft quadrant arm, the actuator must be in the fully retracted position, and the ram air system must be in the full open position.
B. When an actuator has to be replaced because of an actuator motor failure the ram air control must be removed and bench checked per vendor requirements to prevent reoccurrence of actuator failure.
NOTE: You must bench check the ram air control only if you install an actuator with the part number 541674-3 or -5. Actuators with these part numbers do not have motors that can operate with continuous power. A ram air control that is defective and supplies constant power could cause the failure of an actuator.
C. To test the ram air actuator installation, it is necessary to lower the flaps.
2. Equipment and Materials
A. Rigging Pin - 5/16-inch diameter, approximately 6 inches long
3. Remove Ram Air Actuator
A. Open ram air duct access door.
B. Remove electrical connector from actuator (Fig. 401).
C. Remove bonding jumper from actuator.
D. Remove attaching bolt assemblies at upper and lower end of actuator and remove actuator from airplane.
E. Remove the ram air control:
NOTE: You must remove the ram air control only if the actuator that you will install has a part number of 541674-3 or -5.
(1)
Open the L or R RAM MOD circuit breaker on the P6-4 circuit breaker panel.
(2)
Install a DO-NOT-CLOSE tag on the circuit breaker.
(3)
Disconnect the electrical connector from the ram air control.
NOTE: The ram air control is installed on the inboard side of the keel beam downstream of the turbofan.
(4)
Remove the ram air control.
4. Install Ram Air Actuator
A. Install the ram air control if it was removed:
(1)
Make sure that a check has been performed on the ram air control if you install an actuator with a part number of 541674-3 or -5.
(2)
Install the ram air control.
(3)
Connect the electrical connector to the ram air control.
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