The MD-500M is called OH-6A, developed from civilian MD500 with engine power increased. The engine is the same to the civilian version and the total fuel are 227l. This version was deployed in Apr,1968, and the users inclued Japan, Argentina, Bolivia, Denmark, Spain, Mexico and Philipin. The Argentina RACA company and the Japan Kawasaki industry had the license to build this version, the serail are 369HM/OH-6J & 369D/OH-6D. The OH-6J had been taken down from the product line. The MD500 anti-submarine variation for Spain Navy can carry AN/ASQ-81 magnetism sensor on the right side, as well as two MK44 torpedo under the fuselage. The control pannel of the sensor is on the center of the cockpit panel. The standard avionics of OH-6A are, AN/ARC-164 UHF radar, AN/ARC-115 UHF radar, AN/ARC-114 VHF radar, ARN-89 radio direstion finder set, APX-72 IFF, AN/ASN-43 gyro magnetic compass, ID-1315, C-6533/ARC interphone.
MD500M命名为 OH-6A ，是OH-6系列的加大功率型，由民用型MD500发展而来。发动机与MD500民用型相同，但燃油量为227升。该型于1968年4月首次交付使用，购买这种直升机的国家的：日本、阿根廷、玻利维亚、丹麦、西班牙、墨西哥和菲律宾。阿根廷RACA公司和日本川崎重工业公司专利生产这种直升机，编号分别为369HM/OH-6J(现已停产)和369D/OH-6D。OH-6A的标准轻型航空电子设备主要有：AN/ARC-164超高频调幅通信电台、AN/ARC-115超高频调幅通信电台、AN/ARC-114甚高频/调频通信电台、ARN-89无线电罗盘、APX-72敌我识别应答器、AN/ASN-43航向陀螺、ID-1315航向方位指示器及C-6533/ARC机内通话器。
During the vietnam war, the OH-6 was widely used as an observation and cavalry platform. The OH-6 would find targets by flying low, right over the tree tops, and lead in AH-1 Cobras to attack them. The AH/MH-6 Little Bird has been based on both the Army OH-6A Cayuse and originally designed as a military scout. The AH-6 is an attack varient.
越战期间，OH-6被当做观察和快速机动平台广泛使用。OH-6可以在树梢高度飞行，搜索目标，随即引导 AH-1 直升机发起攻击。AH/MH-6“小鸟”以OH-6A和最初设计的民用型为基础，常用于军事侦察，AH-6也可作为攻击改型。
MH-6特种作战直升机
