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information desired can be displayed on the HUD if it is available in the aircraft’s flight computer. The display for the HUD can be projected on a separate panel near the windscreen or as shown in Figure 5-60  on an eye piece. Other information may be displayed, including a runway target in relation to the nose of the aircraft, which allows the pilot to see the information necessary to make the approach while also being able to see out the windshield. 

## Required Navigation Instrument System Inspection 

## Systems Preflight Procedures 

Inspecting the instrument system requires a relatively small part of the total time required for preflight activities, but its importance cannot be overemphasized. Before any flight involving aircraft control by instrument reference, the pilot should check all instruments and their sources of power for proper operation. 

NOTE: The following procedures are appropriate for conventional aircraft instrument systems. Aircraft equipped with electronic instrument systems utilize different procedures. 

## Before Engine Start 

1. Walk-around inspection: Check the condition of all antennas and check the pitot tube for the presence 

of any obstructions and remove the cover. Check the static ports to be sure they are free from dirt and obstructions, and ensure there is nothing on the structure near the ports that would disturb the air flowing over them. 

2. Aircraft records: Confirm that the altimeter and static system have been checked and found within approved limits within the past 24 calendar months. Check the replacement date for the emergency locator transmitter (ELT) batteries noted in the maintenance record, and be sure they have been replaced within this time interval. 

3. Preflight paperwork: Check the Airport/Facility Directory (A/FD) and all NOTAMs for the condition and frequencies of all the navigation aid (NAVAIDs) that are used on the flight. Handbooks, en route charts, approach charts, computer and flight log should be appropriate for the departure, en route, destination, and alternate airports. 

4. Radio equipment: Switches OFF. 

5. Suction gauge: Proper markings as applicable if electronic flight instrumentation is installed. 

6. ASI: Proper reading, as applicable. If electronic flight instrumentation is installed, check emergency instrument. 

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