Lost Communications

T-6A INSTRUMENT NAVIGATION

APPENDIX D

NOTE

Just because the field is a blue field does not indicate the capability

to perform an approach into that field. Remember, 3000 feet is the

minimum emergency field length required.

ENROUTE WEATHER INFORMATION

Once airborne and established on your route, it is prudent to get a weather update, not only for

your intended landing field, but also for weather between your present position and destination.

This information is most easily obtained from a pilot-to-metro facility (PMSV), radio call sign

"METRO." A discussion of this service is contained in the FIH. FSS, radio call sign "(FSS

Name) RADIO", can also be useful sources of current weather. These can be identified on the

IFR charts by the heavy shadow over the air/ground communication boxes. FSS may provide

weather advisories but are not certified weather forecasters. Some selected NAVAIDs have

Transcribed Weather Enroute Broadcast (TWEB) and Hazardous In-flight Weather Advisory

Service (HIWAS) transmitted on the VOR. Refer to the IFR enroute chart legend.

Radio class code "B" VOR stations have scheduled weather broadcasts 15 minutes past every

hour. "AB" radio class VOR stations provide continuous weather broadcasts. The radio class

codes are listed under the individual NAVAIDs in the IFR Supplement.

LOST COMMUNICATIONS

Refer to Procedures for Two-way Radio Failure in the Emergency Procedures Section of the

FIH. It is virtually impossible to provide regulations and procedures applicable to all possible

situations associated with two-way radio communications failure. During two-way radio

communications failure, aircrews are expected to exercise good judgment in whatever action

they elect to take. Verify you have lost communications, Squawk 7600, and comply with the

FIH. In an attempt to cover the majority of situations that will be encountered, the FAA has

published specific procedures (FAR 91.185) that must be complied with and with which all

aircrew shall be familiar. These procedures are available to the aircrew during flight in the

Emergency Procedures Section of the FIH. In all circumstances, the aircrew should monitor all

available communications frequencies.

UNINTENTIONAL THUNDERSTORM PENETRATION

The first and most important rule about thunderstorms is to AVOID THEM and to avoid any area

where they may be found. Should unintentional thunderstorm penetration occur, follow the

NATOPS "Thunderstorms and Turbulence Procedures".

ICING

Refer to the NATOPS "In-flight Icing" procedure. SOP prohibits filing into areas where icing

conditions are forecast. Since instrument flight may involve prolonged operation through areas

SUPPLEMENTAL AND EMERGENCY PROCEDURES D-3