Instrument Oral 40 Exam Questions And Answers

What is a compass locator? - ️️A radio beacon used in conjunction with an ILS marker beacon What limitations apply when using an NDB for navigation? - ️️Subject to disturbances (lightning, precipitation static, interference from nearby stations) that cause erroneous bearing information What operational procedure should be used when navigation or approaches are conducted using an NDB? - ️️Since ADF receivers do not incorporate signal flags to warn pilot of wrong bearing information being received, pilot should continuously monitor the NDBs coded identification. What is an HSI? - ️️Horizontal situation indicator - combination of two instruments: vertical heading indicator and a VOR/ILS indicator. What is an RMI? - ️️Radio magnetic indicator - consists of a rotating compass card, a double-barred bearing indicator, and a single-barred bearing indicator What is DME? - ️️Distance measuring equipment. Provides distance and ground speed info when receiving a VORTAC or TACAN facility. Reliable signals may be received at distances up to 199 NM at line-of-sight altitude. DME operates on ultra-high-frequency spectrum between 960-1215 MHz (distance info is slant-range, not horizontal) When is DME equipment required? - ️️If VOR nav equipment is required for flight at or above FL240 (24,000 ft MSL) then pilot needs DME or appropriate RNAV. If the DME or RNAV fails above this altitude, need to notify ATC immediately and continue operations to next airport of intended landing where repairs or equipment replacement can take place. As a rule of thumb, to minimize DME slant range error, how far from the facility should you be to consider the reading accurate? - ️️Slant range error will be at a minimum if the aircraft is one or more miles from the facility for each 1,000 ft of altitude above the facility.