Flight Training Instruction - Cnatra - U.S. Navy
Flight Training Instruction - Cnatra - U.S. Navy
Flight Training Instruction - Cnatra - U.S. Navy
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T-6B PRIMARY INSTRUMENT NAVIGATION CHAPTER SEVEN<br />
5. Determine wind direction using the same method from VOR station holding (TAIL–<br />
RADIAL–WIND). During VOR over the station holding, the number of degrees of crab, used<br />
on the outbound leg, equals the number of degrees off course after the inbound turn on the nowind<br />
orbit. This will not work as well in holding away from the station due to the greater radial<br />
spacing further from the station.<br />
The following method will aid in determining wind corrections. Refer to Figure 7-9. Here, the<br />
aircraft is holding between 10 to 14 DME on the 038º radial.<br />
a. Determine the outermost leg length - in this case, 14 DME.<br />
b. Determine the length of the holding pattern - 4 NM.<br />
c. Divide the outermost leg length by the length of the holding pattern. 14 ÷ 4 = 3.5<br />
degrees. This is the correction factor for every radial the aircraft is off course.<br />
For example: The aircraft has just completed the outbound leg of the no–wind orbit at 14 DME.<br />
During the turn onto the holding radial, it is determined that the aircraft is 4º off course. Use the<br />
normal tail–radial–wind method to determine wind direction.<br />
Apply the wind correction on your correction orbit: 4º error x 3.5 correction factor = 14º crab<br />
angle into the wind on the outbound leg of the correction orbit. Use half (7º) the crab angle on<br />
the inbound leg. The holding course is relative to the holding fix - NOT the station.<br />
Common Errors.<br />
NOTE<br />
If leg lengths are not specified, consider using Triple the Drift<br />
Method described above for wind corrections.<br />
Figure 7-8 VOR DME / TACAN Holding Fix<br />
1. Holding on the wrong side of the DME fix.<br />
2. Using an insufficient intercept angle to acquire the inbound course.<br />
HOLDING PROCEDURES 7-13