Checklist C-130 Apr 69 Part 2
This checklist was compiled from data available
in AFM 51-40; T.O. 1C-130A-1; T.O. 1C-130A-2-8 AND
TECHNICAL MANUALS FOR INDIVIDUAL
EQUIPMENT MADE AVAILABLE BY CONTRACTORS.
THE CHECKLIST IS INTENDED TO SUPPLEMENT, BUT
NOT REPLACE, THE AIRCRAFT CHECKLIST.� THE
TROUBLE SHOOTING GUIDES HEREIN MAY BE USED TO AID
THE NAVIGATOR IN MAKING MINOR ENROUTE REPAIRS AND
ALSO IN MAKING INTELLIGENT WRITE UPS IN THE AF FORM 781.
ALL PREVIOUS CHECKLISTS ARE OBSOLETE.
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PRE FLIGHT PLANNING
The success of any mission depends upon the amount of effort put forth in the
�planning phase of that mission
FLIGHT PLANNING FOR OVERWATER MISSIONS
THE DAY BEFORE THE FLIGHT
I. WEATHER CHECK
A. Prevailing weather, overall movement of systems and winds aloft.
Make �tentative route selection based on weather and mission requirements.
II. Route
A.  Draw route on charts.
B.  Check NOTAMS
C.  Check FLIGHT PLANNING DOCUMENT
1.  ??
2. Special Use Airspace
3.  ADIZ
4  Loran coverage
5.  Enroute procedures
6.  Special Notices
D. AIRMAN'S INFORMATION MANUAL
(Civilian airfield NOTAMS)����
E.  FLIP Enroute
1. Radio fix coordinates
2. Ocean Station Vessel Information
3. Special Notices
F  FOREIGN CLEARANCE GUIDE
1. NOTAMS for foreign bases
2. CLASSIFIED section
G. Check DOD BULLETIN and BULLETIN DIGEST
1. Latest chart edition
2. Special Notices
H. Check CHUM
1. Loran changes
2. Special Notices
I. Chart
1 Refine route after checking above
2. Annotate SPECIAL USE AIRSPACE
(List altitude and time of restrictions)
3. Circle emergency airfields
4. Annotate ADIZ and FIR boundaries
J. Fill out flight plan
III. PLANNING THE MISSION
A. Determine the navigation aids available and plan which are to be used
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B. STAN/EVAL rides require:
1. Five hours or more and a minimum of three hours over water
2. Celestial (DAY)
3. Pressure Pattern
4. Loran
5. Radio
6. Radar
7. Minimum of two hours of GRID
PREFLIGHTING THE AIRCRAFT
The following procedures will be performed on all flights except as noted.
Where noted that a complete checkout is not needed on 2nd flights of the
day or mission, an operational check will be performed.
A. Exterior Inspection
1. Long wire antenna
2. Radome
B. Check 781 Parts A, B and K
1. Turn on all navigation equipment
C. Check for latest publications
1 Flight Planning Document
2. FLIP Enroute charts and Enroute supplement
3. High and low letdowns
4. Single Sideband frequency book
5. Current Air Almanac and HO 249 Vol I, II and III
6. Emergency map kit
D. Check weight of aircraft
1 Form F for operating weight and fuel load
2. Fuel gauges and 781 Part H
E. Check D-1 Sextant and Mount
1 Assure that the sextant mount is installed correctly.
a. Azimuth counter and crank should face to the rear of the aircraft
b. Lubber line must be underneath the azimuth crank and read same as azimuth counter
2. Open drain on shutter lever assembly
3. Silica Jel (Desiccant): The Silica Jel should be blue.� If celestial is to be used
as a primary aid, replace any sextant showing evidence of moisture.� Locations
of Silica Jel are: in the sextant case, inside glass window at tip of tube, and
on the side of the sextant.
4. Timer: Two minutes +/- two seconds
5. Averager: Using the actuator button, run the sextant for 30 seconds at
altitudes 43� 42� 38� and 37�.� The resultant average should
be 40-00� +/- two minutes of arc.
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6. Determine total sextant error by shooting a celestial body over a known position.
7. Alignment check: Set 000.0 in the Azimuth Counter Window.� When sighting on the
vertical stabilizer and HF Antennas, the reading should be 179 ��.� Small errors in
mount alignment can be removed by rotating the projection lens which is mounted
on top of the bubble cell.� The sextant may be used with alignment errors if these
errors are applied to any heading shots taken.
Remedy
Possible Cause
Trouble
Replace bulb; connect power supply; check external   lead; If still inoperative, send to shop for internal wiring check
Defective bulb; disconnected or weak power supply;   broken wire
Artificial horizon not visible at night.
Replace side bulb; connect power supply; check   external lead. If still inoperative, send to shop for internal wiring check.
Defective bulb; disconnected or weak power supply;   broken wire.
Time dial and altitude counter not visible at night.
Faulty gasket or gradual condensation. Send sextant to shop for drying.
Moisture inside objective window
Mechanical interference; broken pivot or dirty   mechanism.
Averager clock mechanism does not start Send sextant to repair shop.
Index disks do not return to zero when averager   rewind lever is depressed. Mechanical interference or dirty mechanism Loosen screw on winding lever. Reposition the   connecting shaft by inserting a screwdriver in slot and turn shaft to desired   position, at the same time move winding lever to desired position. Remove   screwdriver from connecting shaft and tighten screw on winding lever. Operate   winding lever and check shutter and timer for correct operation. If still   inoperative send sextant to repair shop.
Turn bubble prism mount assembly in or out of the   sextant body to obtain sharpest focus and lock in position with stop screws.
Bubble prism mount assembly loose in sextant housing.
Artificial horizon out of focus.
Altitude counter inoperative.
Broken, damaged, or shifted parts.
Send sextant to repair shop.
Altitude knob will not rotate to full range of   sextant (-10� to + 92�
Jammed or broken stop washers.
Send sextant to repair shop.
Receptacle mount locking device inoperative or rough   rotary movement.
Improper adjustment of locking device; dirty bearings   or lack of lubrication.
Lubricate bearing; if still inoperative, send to   repair shop.
Lubricate bushing grooves inside plate with   appropriate grease (MIL-G-3278).
Shutter assembly operation sticky or rough.
Lack of lubrication.
Loosen lock nut and knob. Position shaft so that its   end is at periphery of periscopic tube assembly.
Improper positioning of shafts (insert and retract   shafts).
Receptacle mount will not admit or hold sextant
Objective field elliptical in shape. Fixed prism mount shifted position.
Send sextant to repair shop.
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F. SCR 718 Radar Altimeter
1 Allow for a three minute warm up.
2. Place the trace just inside the altitude scale with the circle size knob
3. Align the CCW edge of the reference lobe on the zero foot marker on both the times
one and times ten scale
4. Adjust presentation of focus and brilliance with the screwdriver adjustments
on the bottom of the indicator.� ���� THIS CHECK WILL BE PERFORMED ON EVERY FLIGHT.
Possible Cause Remedy
Trouble
Blown fuse on front of RT Replace fuse
No scope indication, power switch on.
Loose or damaged cables.
Check cables.
Replace indicator.
Defective indicator.
Circle sweep cannot be focused or centered
Replace RT
Defective RT unit
Adjust gain.
Receiver gain too low
Reference lobe does not appear on circle sweep
Loose or damaged cables Check cables
No reflected lobe on circle sweep
Connect antenna
Antenna not connected
G. APN-59 RADAR
1 Allow a three minute warm up.
2. Radar pressurization check. Pressurize to 40 in.� Leak down should
not be more than 2 in. of pressure in 10 minutes.�
THIS CHECK WILL BE PERFORMED ON THE FIRST FLIGHT OF MISSION.
3. Check meter readings in all positions.
a. LINE: ������������� 0.52 ? 0.68 and steady
b. MAG: ������������� 0.30 ? 1.00 and steady
c. MIXER 1: ������ 0.30 ? 0.90 and steady
d. MIXER 2: ������ 0.30 ? 0.90 and steady
e. AFC 1: ����������� 0.30 ? 0.90 and steady
f. AFC 2: ������������ 0.30 ? 0.90 and steady
4. perform range mark calibration check.� Place VRM on 30 NM range mark
on the 30 NM range.� Switch to 50 NM range.� The VRM should be on the 30 NM
range mark.� Repeat on all other ranges.�
THIS CHECK WILL BE PERFORMED ON THE FIRST FLIGHT OF MISSION.
The main indication of any radar malfunction is the test meter.� The meter should be
monitored on LINE to determine if the correct power is being applied to the equipment;
periodically all other readings should be checked.� Once a malfunction is observed, first
check the meter readings to determine if the inaccessible components are operating
properly.� If one of these components is defective, both scopes will display the same presentation.
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APN 59 RADAR Component Numerical Designation
RT 289 B ������������������������������ Receiver Transmitter
PP 1073A������������������������������ Power Supply
IP 268������������������������������������ Pilots Indicator
IP 239������������������������������������ Navigators Indicator
AM 853A������������������������������ Electronic Control Amplifier
AS 653����������������������������������� Antenna
CN 221A������������������������������� Stabilization Data Generator
C 1242����������������������������������� Control Panel
The only repair a navigator can make on the radar is to replace blown fuses
and checking secureness of cables.� There are five fuses in the RT unit in the
wheel well.� The fuses, what they power and the symptoms observed if blown
are presented in the table below.
Meter
Symptoms
Fuse
Power
F-101�
�4 amp		 AC to antenna & servo system Sweep present but not rotating when scan on
All readings normal
F-102
   2 amp		 Plate voltage to power supply in RT 289 B. No sweep or dot in either scope LINE- Normal; no MAG;
   AFC or MIX fluxuating .
F-103
   6 amp		 High voltage to Modulator. No sweep, dot in center of both scopes LINE- Normal; no MAG;
   AFC & MIX fluxuating.
F-104
   6 amp		 Blower motors in nav scope & PP1073A No sweep or dot in either scope All readings normal
F-10 Filament No sweep, dot in center of both scopes All reading zero
If the fuses are not blown and the meter readings are normal, the malfunction will be caused
by defective power supplies or indicators.� The trouble shooting guide was designed using the
malfunction, meter reading and the probable cause listed in the most probable order.
Malfunction Meter Readings PROBABLE cause
No line voltage on meter. No LINE 1. No external power
2. Circuit breaker open
3. Fuse F-105 blown
Antenna tilt inoperative normal. 1. Dirty slip rings, use sector scan for a few   minutes to clean rings
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Meter
Malfunction PROBABLE cause
Readings
Antenna stuck in pencil beam
Normal
Dirty slip rings, use sector scan to clean rings
No MAG reading after 3 minute warm-up
No MAG
   LINE normal
1. Fuse F102 blown
2. Defective RT 289B
1. Fuse F102 blown
2. Defective RT 289B
1. a/c power supply
2. Fuse F105 blown
3. Defective RT 289B
IP 268 and IP 239 blank No MAG
   No LINE
Blank wedges appear at different points on both   scopes
Fluctuating MAG or AFC 1-2 or MIX 1-2
Defective RT 289B
Reduced range and weak returns LINE normal, all others low
Defective RT 289B
Intermittent sweep on IP268 & IP 239
1. Normal
   2. Flux. MAG
1. Defective IP 239
2. Defective RT 289B
No change in range when switching range selector
Normal 1. Defective IP 239�  
2.  Defective C1242
3. Defective RT 289B
Spoking on IP 268 and IP 239
1. Defective IP 239� 
2. Defective RT 289B
3. Defective AS 653A
LINE normal, all others flux.
IP 239 & IP 268 sweep -no targets
1. AFC 1-2 or MIX 1,
       2. flux or no read.
2. Normal
Checklist C-130 Apr 69 Part 2
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