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. 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. 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. Required Navigation Instrument System  Inspection Systems Preflight Procedures Before Engine Start 1.  Walk-around inspection: Check the condition of all  antennas and check the pitot tube for the presence  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. Figure 5-60. A head-up display (HUD). 5-36 7  7  5  5  5  5  10  10  24  25  26  W  100  90  80  70  60  50  6 3 2 CRS  360  HDG  360  VOR2  - - . - NM  GSPD  59 KTS  VOR1  6 - - - TRACK  00500  29.89 IN  KDVT 25L  ON RWY 36L  2000  1000  1 4 80 60 4  3  2  1  1  2  3  4 