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 B.  Two DAA are installed on the E1-2 rack in the electrical and electronic compartment.
 CAUTION:_______THE UNIT CONTAINS STATIC SENSITIVE DEVICES. OBSERVE PRECAUTIONS FOR HANDLING ELECTROSTATIC SENSITIVE DEVICES. FAILURE TO OBSERVE ELECTROSTATIC DISCHARGE PRECAUTIONARY PROCEDURES WHEN HANDLING THE DAA MAY RESULT IN DEGRADATION OR FAILURE OF THE DAA.
 C.  The DAA is a 1/2 ATR box that weighs 23.5 pound (10.66 kgms). Two holddown hooks are used to secure the DAA in its mount. There are no external controls or indictors on the front face. Internally, the module contains 13 card assemblies inlcuding two cards supplying unit power. A dual, rear mounted connector interfaces the unit with airplane wiring.
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26V AC
HDGNO. 1
HDGNO. 2
26V AC
HDGNO. 3
26V AC
HDGNO. 4
PITCHNO. 1
26V AC
ROLLNO. 1
PITCHNO. 2
26V AC
ROLLNO. 2

A 737-300/400/500MAINTENANCE MANUAL
DIGITAL ANALOG ADAPTER
DAA Interface SchematicFigure 11 (Sheet 1)

A 737-300/400/500MAINTENANCE MANUAL

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NOTUSED
DAABUS 2

A 737-300/400/500MAINTENANCE MANUAL

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DME
FMC
BUS

MODE

 D.

E.
F.
G.
A
737-300/400/500MAINTENANCE MANUAL
The DAA contains the following internal processing circuits for converting these signals:
 (1)  
Computer

 (2)  
Memory

 (3)  
Interface electronics

 (4)  
Power supplies

 (5)  
BITE, BITE formatting, and monitor circuits

 (6)
Synchro driversFMCS/DAA Interface

 (1)  
The following FMC interface signals are converted as required by the DAA:

 (a)  
Total Fuel (Left DAA only)

 (b)  
Command N1

 (c)  
N1 Limit

 (d)  
FMC Autotune

 (e)  
Autotune/Manual Tune Mode

 (f)  
FMC Agility Tuned DME

 (g)  
FMC Nav Data Outputs

 

 (h)
FMC Nav InputsIRS/DAA Interface

 (1)  
The following IRS interface signals are converted as required by the DAA:

 (a)  
Pitch

 (b)  
Roll

 (c)  
Heading

 (d)  
Yaw Rate

 (e)  
Ground Speed

 

 (f)
Drift AngleDAA Discrete Inputs

 (1)  
The following discrete inputs are provided to the DAA

 (a)  
Remote Test

 (b)  
Oleo strut switch for air/ground logic

 (c)  
Auto/Manual Tuning

 (d)  
DME Valid

 (e)  
VOR/LOC Super Flag

 

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 H.
I.
J.
K.

A
737-300/400/500MAINTENANCE MANUAL
 (f)
Localizer Tuned (VOR/ILS)Abnormal operation of the DAA signal processing, such as pitch, roll and magnetic heading, causes a malfunction code display on the ISDU and a flag to appear on the associated instrument.The DAAs are checked during IRS BITE. Their status is also displayed during FMCS BITE.Figure 11, Sheet 1 shows part of the circuit in the digital analog adapter (DAA) which processes the essential information from the IRU.
　
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