AFI 11-2C-130v3 - BITS

152 AFI11-2C-130V3 23 APRIL 2012
section. The AF Form 4116 deviation checks format solves for "deviation" (DEV) for all
heading reference systems. Some navigation computers such as the SCNS allow the
navigator to input compass ―deviation.‖ In this case reverse the sign of the calculated
―deviation‖ to arrive at ―deviation correction‖ , which is then inputted into SCNS.
11.10.1.1. Compass deviation is not necessarily constant over time or after significant
course changes. Navigators will reconfirm deviation on Category I legs every 3 hours or
after planned course changes of greater than 30 degrees.
11.10.1.2. A deviation check is not required on flights transiting Category I routes of less
than three hours if:
11.10.1.2.1. The aircraft is equipped with two or more operable heading systems (the
standby compass is not considered a system for this requirement).
11.10.1.2.2. The difference between systems does not exceed 2-degrees.
11.10.2. Dual INS Heading Checks. Deviation check not required.
11.10.3. Single INS/SCNS Heading Checks. Record and compare the INS/SCNS true
heading with all compass systems.
11.10.4. In order to obtain an accurate celestial heading check, the exact ZN must be
derived. Exact ZN is obtained by interpolating using exact longitude, latitude, declination,
and LHA. ZN may also be derived from SCNS immediate page and the subpoint of the
celestial body used for the heading check.
11.11. True Airspeed (TAS) Check Procedures.
11.11.1. Accomplish within one hour of initial cruise altitude. Record the time of the check
and the altitude on the pressure altimeter. If using free air temperature gauge, record
indicated outside air temperature (IOAT). Use the heat of compression table on AF Form
4116 to convert IOAT to true outside air temperature (TOAT). If using SCNS temperature,
record TOAT.
11.11.1.1. TAS check not required for C-130H3 aircraft.
11.11.2. Normally, navigators on all C-130 models can use 0 knots for indicated airspeed
(IAS) to calibrated airspeed (CAS) correction and minus 3 knots for CAS to equivalent
airspeed (EAS) correction for TAS above 270 (or minus 2 knots if less than or equal to 270).
11.11.3. ITAS - Indicated TAS. Record the TAS reading from the TAS meter and the
SCNS/INS or other computer (if the aircraft is so equipped). Record the difference between
computed TAS and this reading in the CORR block.
11.12. In-flight Fuel Management Procedures.
11.12.1. Record the fuel readings listed below at level off time and regular time intervals
(coinciding with entries on aircraft performance record), not to exceed 1 hour and 30
minutes. Use section VII, In-flight Fuel Management of the AF Form 4116 to complete inflight
fuel management computations.
11.12.1.1. ETA DEST. Best known arrival time at destination.
11.12.1.2. TIME. Time of the fuel reading.