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 4. Inspection and Operational Check of the Radio and Navigation Systems
____________________________________________________________________
 A. General
 (1)  The radio and navigation systems must have a full examination after the airplane was hit by lightning. The examination is also necessary after heavy static discharges. The level of the inspections and operation tests come from flight crew information and the airplane conditions during and after the incident.
 NOTE: It is not necessary to examine the coaxial cables and the
____
 connectors if the:

 -Radio system had no problems during and after the incident.
 -Operational checks were done and no problems were found.
 B. References
 (1)  
AMM 23-11-00/501, HF Communication System

 (2)  
AMM 23-12-00/501, VHF Conmmunication System

 (3)  
AMM 34-31-00/501, ILS Navigation System

 (4)  
AMM 34-32-00/501, Marker Beacon System

 (5)  
AMM 34-33-00/501, Radio Altimeter System

 (6)  
AMM 34-51-00/501, VOR System

 (7)  
AMM 34-53-00/501, ATC System

 (8)  
AMM 34-55-00/501, DME System

 (9)  
AMM 34-57-00/501, Automatic Direction Finder (ADF) System

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 (10) AMM 34-22-00/201, Standby Magnetic Compass
 C.  Examine the Radio and Navigation Systems
 S 212-053
 (1)  Examine the HF system for damage.
 (a)  
Examine the antennas for damage.
 1) Replace damaged antennas as necessary.

 (b)  
Examine the tuners for damage and arcing.
 1) Replace damaged tuners as necessary.
 2) Deleted HF arrester inspection.

 

 S 212-054
 (2)  Examine the VHF-VOR-DME-ATC-MARKER systems for damage.
 (a)  
Examine the antennas for damage.
 1) Replace damaged antennas as necessary.

 (b)  
Examine the coaxial cables and connectors for damage if it is necessary. 1) Replace the damaged coaxial cables if it is necessary.

 S 212-055
 (3)  Examine the Radar System (Radome) (AMM 53-52-01/601).
 (a)  
Look for pin holes, punctures, and paint that has chipped.

 (b)  
Repair the radar system if it is necessary.

 (c)  
Replace damaged radome if it is necessary.

 (d)  
Examine the radome diverter strips (AMM 53-52-01/601). 1) Make sure the the diverter strips are correctly attached to the airframe.

 2)  Replace the damaged radome diverter strips if it is necessary.

 (e)  
If the radome is damaged, examine the antenna and the waveguide for damage. 1) Replace damaged antenna and waveguide if it is necessary.

 D.  Radio and Navigation System Operational Checks
 S 712-059
 (1)  Do an operational check of the radio and navigation systems.
 NOTE: After a lightning strike, an operational check of all
____ radio and navigational systems must be done. If a malfunction is found or reported by the flight crew, do the detailed operational check as shown in the applicable maintenance manual section.
 (a)  Do an operational check on some frequencies of each HF system (AMM 23-11-00/501). 1) Deleted step to make sure the VSWR is within tolerance. 2) Monitor many active frequencies on each system to make sure
 the HF receiver operates.
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 3) Do a ground check of each system with a station that is not
 less than 100 miles away.
 (b)  Do an operational check of the VHF system (AMM 23-12-00/501).
 1) Do a loading check on some frequencies on each VHF
　
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