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 (2)  
Do the steps that follow:

 (a)  Open these circuit breakers on the overhead panel, P11, and attach DO-NOT-CLOSE tags: 1) 11J7, FLIGHT RECORDER AC 2) 11J8, FLIGHT RECORDER DC
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 (3)  
If you use test equipment other than the hand-held download unit (HHDLU), install the tester to the test connector at the right side panel, P61.

 S 865-858-002

 (4)  
If you use the hand-held download unit (HHDLU), attach the HHDLU to the test connector at the front side of the flight data recorder.

 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).
 
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MAINTENANCE MANUAL

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 (5)  Remove the DO-NOT-CLOSE tags and close the P11 panel circuit breakers:
 (a) (b)  11J7, FLIGHT RECORDER AC11J8, FLIGHT RECORDER DC
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 (6)  Supply electrical power (AMM 24-22-00/201).
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 (7)  With the Data Signal Display Unit (DSDU), set the control switches on the tester as follows:
 (a) (b) (c) (d) (e) (f)  Set the power switch to the ON position.Set the INPUT switch to the ARINC INPUT DATA position.Set the SYNC switch to the SYNC B position.Set the DATA PARAMETER/DOCUMENTARY switch to the DATA PARAMETER position.Set the OCTAL DISPLAY switch to the 12 BIT position.Set the SUBFRAME and WORD as specified.
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 (8)  With the Teledyne tester (P/N 2222786), set the switches on the tester as follows:
 (a) (b) (c) (d) (e) (f)  Set the POWER switch to the ON position.Set the READOUT switch to the ACTF DATA position.Set the UPDATE switch to the AUTO position.Set the DFDAU/DFDR DATA SELECTOR switch to the DFDAU position.Set the DATA switch to the 12 BIT position.Set the SUBFRAME and WORD as specified.
 S 865-861-002
 (9)  With the Teledyne tester (P/N 2229738), set the switches on the tester as follows:
 (a) (b) (c)  Push the CLR switch two or three times to clear all inputs.Push the DFDR switch and then the ENT switch.Set the SUBFRAME and WORD as specified.
 S 865-862-002

 (10) 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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