An A320 failed to maintain glide slope during descent after autocapture after the pilot in command programmed an airspeed increase.
Synopsis
An A320 failed to maintain glide slope during descent after autocapture after the pilot in command programmed an airspeed increase.
Narrative
Rewritten in plain English from NASA’s original all-caps telegraphic report — facts, figures, and terminology preserved.
ATC clearance: cross FNUCH at or above 7000 feet; cleared ILS runway 22R. Aircraft: A320 with autopilot on autopilot #1; and autothrottles.
Event: Aircraft captured glide slope and began descent. The captain increased airspeed from 220 knots to 250 knots. Engines spooled up; and airspeed increased.
First officer noticed aircraft departing the glide slope and starting a climb. First officer alerted the captain; and the captain disengaged the autopilot and autothrottle; and returned the aircraft to the glide slope.
Show the original NASA report (verbatim, telegraphic)
ATC CLRNC: CROSS FNUCH AT OR ABOVE 7000 FT; CLRED ILS RWY 22R. ACFT: A320 WITH AUTOFLT ON AUTOPLT #1; AND AUTOTHROTTLES. EVENT: ACFT CAPTURED GS AND BEGAN DSCNT. THE CAPT INCREASED AIRSPD FROM 220 KTS TO 250 KTS. ENGS SPOOLED UP; AND AIRSPD INCREASED. FO NOTICED ACFT DEPARTING THE GS AND STARTING A CLB. FO ALERTED THE CAPT; AND THE CAPT DISENGAGED THE AUTOPLT AND AUTOTHROTTLE; AND RETURNED THE ACFT TO THE GS.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.