NOTE: To get access to the FDR, open the lower ceiling panel No. 1
____ above the aft galley (AMM 25-22-02/401). The HHDLU can only be connected to the AlliedSignal flight data recorder (FDR).
 S 864-044
 (3)  
Supply electrical power (AMM 24-22-00/201).

 S 864-022

 (4)  
Remove the DO-NOT-CLOSE tags and close the P11 panel circuit breakers:

 (a)  
11J7, FLIGHT RECORDER AC

 (b)  
11J8, FLIGHT RECORDER DC

 (c)  
11S1, AID SENSOR

 S 864-045
 (5)  
Pressurize the left, right, and center hydraulic systems and hydraulic systems reservoirs (AMM 29-11-00/201).

 S 864-055

 (6)  
With the Data Signal Display Unit (DSDU), set the control switches on the tester as follows:

 (a)  
Set the power switch to the ON position.

 (b)  
Set the INPUT switch to the ARINC INPUT DATA position.

 (c)  
Set the SYNC switch to the SYNC B position.

 (d)  
Set the DATA PARAMETER/DOCUMENTARY switch to the DATA PARAMETER position.

 (e)  
Set the OCTAL DISPLAY switch to the 12 BIT position.

 (f)  
Set the SUBFRAME and WORD as specified.

 
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757
MAINTENANCE MANUAL

 S 864-056
 (7)  With the Teledyne tester (P/N 2222786), set the switches on the tester as follows:
 (a)  
Set the POWER switch to the ON position.

 (b)  
Set the READOUT switch to the ACTF DATA position.

 (c)  
Set the UPDATE switch to the AUTO position.

 (d)  
Set the DFDAU/DFDR DATA SELECTOR switch to the DFDAU position.

 (e)  
Set the DATA switch to the 12 BIT position.

 (f)  
Set the SUBFRAME and WORD as specified.

 S 864-057
 (8)  With the Teledyne tester (P/N 2229738), set the switches on the tester as follows:
 (a)  
Push the CLR switch two or three times to clear all inputs.

 (b)  
Push the DFDR switch and then the ENT switch.

 (c)  
Set the SUBFRAME and WORD as specified.

 S 864-058
 (9)  With the hand-held download unit (HHDLU), do the steps that follow:
 NOTE: These steps are for airplanes equipped with AlliedSignal FDR
____
 only.

 (a)  
On the flight recorder control panel (FRCP), set the function switch to the ON position.

 (b)  
Push the red button on top of the HHDLU.
　
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