8/15/19 12/31/20  Pilot/Controller Glossary Pilot/Controller Glossary  EN ROUTE DESCENT- Descent from the en route  cruising altitude which takes place along the route of  flight.  EN ROUTE HIGH ALTITUDE CHARTS- EN ROUTE LOW ALTITUDE CHARTS- (See AERONAUTICAL CHART.)  (See AERONAUTICAL CHART.)  EN ROUTE MINIMUM SAFE ALTITUDE WARN- ING (E-MSAW)- A function of the EAS that aids the  controller by providing an alert when a tracked  aircraft is below or predicted by the computer to go  below a predetermined minimum IFR altitude  (MIA).  EN ROUTE SPACING PROGRAM (ESP)- A  program designed to assist the exit sector in  achieving the required in-trail spacing.  EN ROUTE TRANSITION- a.  Conventional STARs/SIDs. The portion of a  SID/STAR that connects to one or more en route  airway/jet route.  b.  RNAV STARs/SIDs. The portion of a STAR  preceding the common route or point, or for a SID the  portion following, that is coded for a specific en route  fix, airway or jet route.  (See EN ROUTE SPACING PROGRAM.)  (See ESTIMATED.)  ESP- EST- ESTABLISHED- To be stable or fixed at an altitude  or on a course, route, route segment, heading,  instrument approach or departure procedure, etc.  ESTABLISHED ON RNP (EoR) CONCEPT– A  system of authorized instrument approaches, ATC  procedures, surveillance, and communication re- quirements that allow aircraft operations to be safely  conducted with approved reduced separation criteria  once aircraft are established on a PBN segment of a  published instrument flight procedure.  ESTIMATED (EST)-When used in NOTAMs  “EST” is a contraction that is used by the issuing  authority only when the condition is expected to  return to service prior to the expiration time. Using  “EST” lets the user know that this NOTAM has the  possibility of returning to service earlier than the  expiration time. Any NOTAM which includes an  “EST” will be auto-expired at the designated  expiration time.  ESTIMATED ELAPSED TIME [ICAO]- The  estimated time required to proceed from one  significant point to another.  (See ICAO Term TOTAL ESTIMATED ELAPSED  TIME.)  ESTIMATED OFF-BLOCK TIME [ICAO]- The  estimated time at which the aircraft will commence  movement associated with departure.  ESTIMATED POSITION ERROR (EPE)- (See Required Navigation Performance)  ESTIMATED TIME OF ARRIVAL- The time the  flight is estimated to arrive at the gate (scheduled  operators) or the actual runway on times for  nonscheduled operators.  ESTIMATED TIME EN ROUTE- The estimated  flying time from departure point to destination  (lift-off to touchdown).  ETA- ETE- (See ESTIMATED TIME OF ARRIVAL.)  (See ESTIMATED TIME EN ROUTE.)  EXECUTE MISSED APPROACH- Instructions  issued to a pilot making an instrument approach  which means continue inbound to the missed  approach point and execute the missed approach  procedure as described on the Instrument Approach  Procedure Chart or as previously assigned by ATC.  The pilot may climb immediately to the altitude  specified in the missed approach procedure upon  making a missed approach. No turns should be  initiated prior to reaching the missed approach point.  When conducting an ASR or PAR approach, execute  the assigned missed approach procedure immediately  upon receiving instructions to “execute missed  approach.”  (Refer to AIM.)  EXPECT (ALTITUDE) AT (TIME) or (FIX)- Used  under certain conditions to provide a pilot with an  altitude to be used in the event of two-way  communications failure. It also provides altitude  information to assist the pilot in planning.  (Refer to AIM.)  PCG E-2 