Date: 202202
Local time of day: 1801-2400
Location: LGA.Tower, NY
Weather elements / visibility: Icing; Turbulence
Light: Night
Aircraft: Medium Transport
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Landing
Airspace: Class B LGA
Aircraft component: Autothrottle/Speed Control
Component problem: Malfunctioning
Reporter organization: Air Carrier
Reporter function: Pilot Flying; First Officer
Reporter qualification: Flight Crew Instrument; Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP)
Human factors: Workload; Troubleshooting; Situational Awareness; Time Pressure; Distraction; Communication Breakdown
Second reporter function: Pilot Not Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Landing Without Clearance
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Overcame Equipment Problem
Contributing factors: Environment - Non Weather Related; Aircraft; ATC Equipment / Nav Facility / Buildings
Primary problem: Ambiguous

Narrative: We were cleared directly to BENNG roughly 20 miles out by Approach. The approach is a Non-Autopilot coupled approach (ILS 04 LGA) so the Captain being Pilot Flying set up the aircraft earlier than normal to insure we would be stable when needed. Shortly after turning inbound we switched over to Tower and simultaneously the throttle rolled back to the point that if left alone the aircraft would be in an undesired state. The Captain attempted to ease the throttle up to see if it would mitigate the situation but it didn't. He proceeded to turn them off all the automation and I monitored closely the instruments while doing my flows and call outs; I advised the speed fluctuations verbally 'speed increasing/decreasing.'Due-to the 5G network in the area and active NOTAM in the ATIS I was being extra vigilant with my focus on the aircraft instruments. We were configured and stable at my 1000 ft. and 500 ft. call outs and continued on the approach to land. After landing; Tower gave us directions to turn off and go ground. While turning off we noticed the landing light was still off giving us the cue that we may have missed the landing clearance. Tower gave us instructions to taxi off the runway per normal operation; and at no point did Tower or Ground advise that there was an issues; and nothing further was said to us. Verify landing light on. Clearance received at 1000 ft. configured call.


Second narrative: We were cleared directly to BENNG roughly 20 miles out by Approach. The approach is a Non-Autopilot coupled approach (ILS 04 LGA) so I decided to start to set up the aircraft earlier than normal to insure we would be stable when needed. Shortly after turning inbound we switched over to Tower and simultaneously the throttle rolled back to the point that if left alone the aircraft would stall. I attempted twice to ease the throttle up to see if it would correct and it did not; so I chose to turn them off while still on the Flight Director. I advised what I was noticing to the First Officer who then looked to notice any other deviations. During this time I am still making call outs to finish configuring the plane while looking for any other deviations due to the 5G network in the area. We were configured and stable when needed and continued on the approach to land. After landing; Tower gave us directions to turn off and go to Ground. While turning off we noticed the landing light was still off giving us the cue that we may have missed the landing clearance. Tower gave us instructions to taxi off the runway per normal operation; at no point did Tower or Ground advise that there was an issue. [I suggest] being more aware when an abnormal situation comes up as such; remember once situation is over to zoom out and look at the bigger picture; [and to] confirm the landing light is on when cleared to land if unsure earlier.


Synopsis: Air Carrier Pilot Crew reported while on final approach the autothrottle failed to keep the aircraft on speed. As the aircraft slowed the pilots disconnected the autothrottle and continued in manual mode to landing. The pilots reported they were aware of 5G interference around LGA.