Air carrier captain on approach; at 3000 feet; to runway 22 at mhlm noticed another aircraft join fi...

Narrative:

On a 5 mile final approach to runway 22 at mhlm and at 3000 feet MSL; I noticed aircraft Y also joining final to the same runway from the opposite side and descending to 4000 feet. Aircraft Y joined approximately 50 to 100 yards in front of us to the same runway. Two calls to ATC asking what was going on with the traffic went unanswered. At 3000 feet in mountainous terrain we had very few options if the aircraft Y continued to descend on final. Eventually aircraft Y executed a 360 degree turn to the right and a descent to join final behind us. They landed shortly after we cleared the runway. Never seen anything like this in 30 years. Very disconcerting.

Original NASA ASRS Text

Title: Air carrier Captain on approach; at 3000 feet; to Runway 22 at MHLM noticed another aircraft join final directly above at 4000 feet. Inquires to ATC went unanswered but eventually the aircraft turned out bound and rejoined final behind them.

Narrative: On a 5 mile final approach to runway 22 at MHLM and at 3000 feet MSL; I noticed Aircraft Y also joining final to the same runway from the opposite side and descending to 4000 feet. Aircraft Y joined approximately 50 to 100 yards in front of us to the same runway. Two calls to ATC asking what was going on with the traffic went unanswered. At 3000 feet in mountainous terrain we had very few options if the Aircraft Y continued to descend on final. Eventually Aircraft Y executed a 360 degree turn to the right and a descent to join final behind us. They landed shortly after we cleared the runway. Never seen anything like this in 30 years. Very disconcerting.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1416021
Time
Date	201701
Local Time Of Day	0601-1200
Place
Locale Reference	MHLM.Airport
State Reference	FO
Aircraft 1
Make Model Name	Large Transport
Operating Under FAR Part	Part 121
Flight Phase	Final Approach
Flight Plan	IFR
Aircraft 2
Make Model Name	Medium Transport
Flight Phase	Final Approach
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 73
Events
Anomaly	ATC Issue All Types

Air carrier captain on approach; at 3000 feet; to runway 22 at mhlm noticed another aircraft join final directly above at 4000 feet. Inquires to ATC went unanswered but eventually the aircraft turned out bound and rejoined final behind them.