Garmin GNC 420 GPS Receiver User Manual


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400 SERIES MAINTENANCE MANUAL Page 3-13
P/N 190-00140-05 Rev. C
Table 3-8. Testing FailuresNAV Board
TEST FAILURE TEST
PARAGRAPH
RECOMMENDED ACTION
Localizer Course Deviation Test 5.7.4.1 Replace Nav Receiver Board (see paragraph 4.5.6)
To/From Deflection Output
Characteristic Test
5.7.4.2 Replace Nav Receiver Board (see paragraph 4.5.6)
To/From Deflection Accuracy Test 5.7.4.3 Replace Nav Receiver Board (see paragraph 4.5.6)
Course Deviation Flag Output
Characteristic Test
5.7.4.4 Replace Nav Receiver Board (see paragraph 4.5.6)
Course Deviation Flag Test 5.7.4.5 Replace Nav Receiver Board (see paragraph 4.5.6)
VOR/LOC Super Flag Output Test 5.7.4.6 Replace Nav Receiver Board (see paragraph 4.5.6)
Nav Input Lines 5.7.4.7 Replace Nav Receiver Board (see paragraph 4.5.6)
Nav OBI Outputs 5.7.4.8 Replace Nav Receiver Board (see paragraph 4.5.6)
Nav Serial DME Outputs 5.7.4.9 Replace Nav Receiver Board (see paragraph 4.5.6)
Nav Parallel DME Outputs 5.7.4.10 Replace Nav Receiver Board (see paragraph 4.5.6)
Table 3-9. Testing FailuresGlideslope
TEST FAILURE TEST PARAGRAPH RECOMMENDED ACTION
G/S Course Deviation Output
Characteristic Test
5.7.5.1 Replace Glideslope Board (see paragraph 4.5.6)
Course Deviation Deflection
Accuracy Test
5.7.5.2 Replace Glideslope Board (see paragraph 4.5.6)
Course Deviation Flag Test 5.7.5.3 Replace Glideslope Board (see paragraph 4.5.6)
G/S Superflag Output Test 5.7.5.4 Replace Glideslope Board (see paragraph 4.5.6)
Receiver Sensitivity 5.7.5.5 Replace Glideslope Board (see paragraph 4.5.6)
Centering Accuracy 5.7.5.6 Replace Glideslope Board (see paragraph 4.5.6)
AGC 5.7.5.7 Replace Glideslope Board (see paragraph 4.5.6)
Selectivity (Bandwidth) 5.7.5.8 Replace Glideslope Board (see paragraph 4.5.6)
Nose Bandwidth 5.7.5.9 Replace Glideslope Board (see paragraph 4.5.6)
Skirt Bandwidth 5.7.5.10 Replace Glideslope Board (see paragraph 4.5.6)
Spurious Response 5.7.5.11 Replace Glideslope Board (see paragraph 4.5.6)
Status Tests 5.7.5.12 Replace Glideslope Board (see paragraph 4.5.6)
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