Flight crew reported ILS Glideslope interference on final inbound to MIA along with a missed frequency change.
Synopsis
Flight crew reported ILS Glideslope interference on final inbound to MIA along with a missed frequency change.
Narrative
After being cleared the RNAV 26R to MIA the approach was flown using standard procedures. At 1;000 AGL we were stable; configured and on glide slope. Following the 1;000 ft. call out I noticed the glide slope started bouncing up and down as if there was some interference. We continued on the PAPI as we were in visual conditions. As we continued on the approach; the glide slope oscillations got more severe until the glide slope eventually went full scale deflection. Still in visual conditions and on glide slope we continued the approach. We touched down in the TDZ and the approach/landing was completed uneventfully. Upon turning off the runway we realized that we were still on with Approach Control and were never given the handoff to Tower for a landing clearance. Upon realizing the mistake we contacted Tower to cross the parallel runway and taxied to the gate. The flight was completed without incident. I believe the mistake was caused by a combination of a distraction with the glide slope amid ongoing company issues with 5G coupled with Approach Control not giving us a frequency change to Tower. Maintaining better situational awareness allowing us to query ATC when not given frequency change we were expecting.
Second reporter narrative
Landed 26R without landing clearance. Didn't realize it until we were clear of runway; holding short of 26L without radio contact with Tower.Cleared to intercept RNAV GPS 26R at 2;000 ft. Looked at Tower frequencies on approach plate but didn't enter frequency as I was waiting to hear change to Tower frequency from Approach Control. Continued approach and configured aircraft; running checklist to completion at 1;000 ft. and inside final approach fix. Was never cleared to Tower frequency and was distracted by configuration calls/process for stable approach. FO (First Officer) flew stabilized approach and just above DA the ILS glide slope warning went off causing further distraction. Continued stable approach to landing; cleared runway and waited for Tower to give direction before continuing. Talked about talking to Ground and putting in Ground frequency and then realized we're still on Approach. Switched to Tower and received clearance to cross 26L and taxi to gate. Slowing earlier on approach to make configuration timing less compressed. Not changing habituated loading of next frequency (Tower; Ground; etc.). Verbalizing 'Cleared to land' after configuration checks. Prompting approach for change to Tower frequency.
Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.