Pilot/Controller Glossary  8/15/19  b.  Signal strength or quality of the received signal  falls below acceptable values.  FLAG ALARM- (See FLAG.)  FLAMEOUT- An emergency condition caused by a  loss of engine power.  FLAMEOUT PATTERN- An approach normally  conducted by a single-engine military aircraft  experiencing loss or anticipating loss of engine  power or control. The standard overhead approach  starts at a relatively high altitude over a runway  (“high key”) followed by a continuous 180 degree  turn to a high, wide position (“low key”) followed by  a continuous 180 degree turn final. The standard  straight-in pattern starts at a point that results in a  straight-in approach with a high rate of descent to the  runway. Flameout approaches terminate in the type  approach requested by the pilot (normally fullstop).  FLIGHT CHECK- A call sign prefix used by FAA  aircraft engaged in flight inspection/certification of  navigational aids and flight procedures. The word  “recorded” may be added as a suffix; e.g., “Flight  Check 320 recorded” to indicate that an automated  flight inspection is in progress in terminal areas.  (See FLIGHT INSPECTION.)  (Refer to AIM.)  FLIGHT FOLLOWING- (See TRAFFIC ADVISORIES.)  FLIGHT INFORMATION REGION- An airspace of  defined dimensions within which Flight Information  Service and Alerting Service are provided.  a.  Flight Information Service. A service provided  for the purpose of giving advice and information  useful for the safe and efficient conduct of flights.  b.  Alerting Service. A service provided to notify  appropriate organizations regarding aircraft in need  of search and rescue aid and to assist such  organizations as required.  FLIGHT INFORMATION SERVICE- A service  provided for the purpose of giving advice and  information useful for the safe and efficient conduct  of flights.  FLIGHT INFORMATION SERVICE- BROADCAST (FIS-B)- A ground broadcast service  provided through the ADS-B Broadcast Services  network over the UAT data link that operates on 978  MHz. The FIS-B system provides pilots and flight  crews of properly equipped aircraft with a cockpit  display of certain aviation weather and aeronautical  information.  FLIGHT INSPECTION- Inflight investigation and  evaluation of a navigational aid to determine whether  it meets established tolerances.  (See FLIGHT CHECK.)  (See NAVIGATIONAL AID.)  FLIGHT LEVEL- A level of constant atmospheric  pressure related to a reference datum of 29.92 inches  of mercury. Each is stated in three digits that represent  hundreds of feet. For example, flight level (FL) 250  represents a barometric altimeter indication of  25,000 feet; FL 255, an indication of 25,500 feet.  (See ICAO term FLIGHT LEVEL.)  FLIGHT LEVEL [ICAO]- A surface of constant  atmospheric pressure which is related to a specific  pressure datum, 1013.2 hPa (1013.2 mb), and is  separated from other such surfaces by specific  pressure intervals.  FLIGHT LINE- A term used to describe the precise  movement of a civil photogrammetric aircraft along  a predetermined course(s) at a predetermined altitude  during the actual photographic run.  FLIGHT MANAGEMENT SYSTEMS- A comput- er system that uses a large data base to allow routes  to be preprogrammed and fed into the system by  means of a data loader. The system is constantly  updated with respect to position accuracy by  reference to conventional navigation aids. The  sophisticated program and its associated data base  ensures that the most appropriate aids are automati- cally selected during the information update cycle.  PCG F-3  Note 1: A pressure type altimeter calibrated in  accordance with the standard atmosphere:  a.  When set to a QNH altimeter setting, will  indicate altitude;  b.  When set to a QFE altimeter setting, will  indicate height above the QFE reference datum;  and  c.  When set to a pressure of 1013.2 hPa  (1013.2 mb), may be used to indicate flight levels.  Note 2: The terms ‘height' and ‘altitude,' used in  Note 1 above, indicate altimetric rather than  geometric heights and altitudes. 