The only useful lesson from this mishap could be this: be careful what airline you allow your loved ones to fly. The Aircraft Accident Investigation Board failed to examine what exactly the pilots were using for vertical navigation and it could very well be the pilots simply started down at a given descent rate, expecting to see the runway sooner or later. Be careful who you fly with too, instrument skills are not always evident in those who possess valid licenses.
Everything here is from the references shown below, with a few comments in an alternate color.
Photo: The evacuation process, from AAIB, figure 17.
Figure: WADD VOR/DME Rwy 09 Approach, from AAIB, figure 10.
According to the cockpit voice recorder, the PF/SIC stated the runway was not in sight right after the EGPWS "One Thousand" call, the PM/PIC stated "approach light in sight" and decided to continue the approach. Contrary to the text in the report, the CVR does not report the PF/SIC ever stated he had the runway in sight, and yet he continued flying the airplane with no visual references.
At this point the aircraft was well below the MDA and losing sight of the runway should have prompted an immediate go around.
It is unclear what the pilots were using for vertical guidance during the approach. The flight data recorder shows a fairly constant descent from at least 1,500' AGL which indicates they did not level off at the MDA and attempt a "dive and drive" approach. The report does not mention a vertical navigation capability or usage in the cockpit. It is unlikely they were using the PAPI as the only external lighting reported by the pilots, erroneously as it turns out, was the approach lights. The report fails to investigate this angle to the mishap.
Figure: Aircraft flight path, from AAIB, figure 3.
(Indonesia) Aircraft Accident Investigation Report, National Transportation Safety Committee, Republic of Indonesia, 2014, PT. Lion Mentari Airlines (Lion Air), Boeing 737-800, PK-LKS, Ngurah Rai International Airport, Bali, Republic of Indonesia, 13 April 2013
Copyright 2019. Code 7700 LLC. All Rights Reserved.