(2)  
The navigation data base contains all information required for operation in a specified geographic area. This information includes data for:

 (a)  
VOR, DME, VORTAC, and TACAN navigation aids

 (b)  
Waypoints

 (c)  
Airports and runways

 (d)  
Terminal area procedures and approaches.

 (e)  
Enroute airways

 (f)  
Holding patterns

 (g)  
Company route structures

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737-300/400/500MAINTENANCE MANUAL
 (3)  
As a supplement to the content of the permanent current navigation data base (and data base revisions); the system will accept pilot-entered data for additional navigation aids, waypoints, and airports. These pilot entries will be retained in the FMC memory until flight completion.

 (4)  
Data Base Update Loading

 (a)  
Upon the expiration date of the navigation data base, a new navigation data base must be loaded into the FMC. The new data base must be valid for the next period of effectivity.

 (b)  
When the airplane is on the ground, an external portable data loader can be connected to a flight deck mounted electrical receptacle. Connecting the loader to the receptacle allows the loader to load and update the navigation data base, without removing the FMC from the airplane.

 H.  Performance Data Base
 (1)  The systems performance data base is contained in the permanent program memory of the FMC. It consists of:
 (a)  
A detailed aerodynamic model of the airplane. The aerodynamic model includes basic high-speed drag polars, a buffet limit envelope, and stored values of the airplanes certified operating limits. The aerodynamic model also includes speed and altitude capability data that are required to support the adjustment of performance computations, for engine-out operating conditions.

 (b)  
A fuel flow and thrust model for the type of engine installed on the airplane. The model is used during computations of fuel flow, thrust, engine limits, and target values. Also the model is used for corrections due to the affects of air-conditioning, anti-icing, and air bleeds.

 6.  Fuel Summation Unit (Fig. 8)___________________
 A.  The fuel summation unit integrates the serial digital data fuel quantity tank indicator inputs and develops total fuel analog output.
 B.  The tank quantity indicators provide serial digital data representing fuel quantity to the demodulator-latch circuits into the summation unit. The demodulator-latch circuits removes the serial digital data from the line.
 C.  Any unused tank inputs are grounded to eliminate spurious signals.
 D.  The fuel summation unit scans and inputs one fuel quantity indicator line at a time. As each tank fuel quantity is input, it is added to a running total and saved. If any line has over 32 consecutive errors, its quantity is set to zero and an error flag is set. In-line memory tests are performed during the operation of the summation unit. A malfunction of the summation unit will cause the total fuel quantity output to be set to zero but will not affect the individual fuel indicators.
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737-300/400/500
MAINTENANCE MANUAL

115V AC
TANK NO. 1 IND
CTR TANK 1 CELL IND
CTR TANK 2 CELL IND
CTR TANK 3 CELL IND
CTR INTEG TANK IND
TANK NO. 2 IND
AFT AUX 810 TANK IND
AFT AUX 1070 TANK IND
AFT AUX 400 TANK IND
TANK QTY
JUMPER 17 10V AC REF
18 TOTAL FUEL 19 SIGNAL GROUND

J1 24 REG & HLDC RECT
REG & LLDC RECT J1 REG 23
LLDC
DEMOD

1
LATCH
DEMOD

2
LATCH
DEMOD

3
LATCH
DEMOD

4
LATCH
　
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