INSTRUMENT FLIGHT RULES WORKBOOK
IFR ALTERNATE MINIMUMS
CEILING AND VISIBILITY MINIMUMS NOT APPLICABLE TO USA/USN/USAF. PILOTS MUST
REVIEW THE IFR ALTERNATE MINIMUMS NOTES FOR ALTERNATE AIRFIELD SUITABILITY.
NA - means alternate minimums are not authorized due to unmonitored facility or absence of
weather reporting service. Civil pilots see FAR 91. USA/USN/USAF pilots refer to appropriate
CRAIG MUNI (CRG) .ILS RWY 32
VOR OR GPS RWY 14
╣NA when control tower closed.
▓Category D, 800-2╝.
Figure 4-11 IFR Alternate Minimums
Normally, an alternate must have an instrument approach compatible with operable installed
aircraft navigational equipment. If no suitable instrument approach is available, then the forecast
weather must permit a descent from the minimum enroute altitude in VFR weather conditions.
Let's suppose that you want to use Orlando Sanford, Florida as your alternate. Sanford's
published instrument approaches are an NDB RWY 9 and an ILS RWY 9L (no VOR or TACAN
approaches). If Sanford is forecasting clear and 7 miles visibility, then a T-34C pilot can easily
use it as an alternate because the forecast weather will allow a VFR approach from the minimum
Flight plans may be filed to destinations that do not have published approaches compatible with
operable installed aircraft navigation equipment. In this case, a suitable alternate must have a
published instrument approach the aircraft can execute in the event of lost radio communications.
Figure 4-12 No Alternate Required
When the destination weather is forecasted to be 3000 feet and 3 miles visibility or better, an
alternate is not required. (Figure 4-12) (An alternate may be required for other reasons, so
check all applicable publications.)
403. IFR FLIGHT PLAN
A pilot will file a military flight plan (DD 175) with Base Ops or FAA Form 7233-1 with FSS.
Detailed information concerning the correct procedures for filling out the flight plan can be
found in FLIP GENERAL PLANNING (GP), Chapter Four. Students are strongly encouraged
to utilize this section. OPNAVINST 3710.7 states that a flight plan will be filed for all flights of
naval aircraft. The flight plan serves two purposes. Primarily it is used to relay the desires of the
4-12 INSTRUMENT FLIGHT RULES