Ajit Pawar plane crash: What is landing system instrument and how it could have averted the mishap?

Retired pilot Ehsan Khalid said he believes the runway couldn't be a factor behind the crash, however, the landing system instrument could have guided the pilot in a proper way.
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Baramati plane crash: Lack of instrument landing system may have contributed, say aviation experts

A probe is being carried out by the Aircraft Accident Investigation Bureau (AAIB) to know the exact cause of the accident.