Air Traffic Control Fully Certified
Communication Breakdown; Situational Awareness
ATC Issue All Types
General None Reported / Taken
Human Factors
Helicopter X was 5 miles west of the field and requested a northwest arrival to the terminal. I approved the arrival and restricted a helicopter at or above 2;500 for traffic 10 miles north inbound to Runway 8; the B717 descending though 2;500. Helicopter Y was also 5 west of the field requesting a northwest arrival. I told him to follow his company and gave him the same restriction; he said he had his company in sight. Helicopter Y then asked to change to a west arrival and I approved that. Then Helicopter X asked to also change to a west arrival and I approved that. At this point Helicopter Y was number 1 to the field and Helicopter X was number 2. I failed to tell them this. From out the window it didn't look like a factor. Helicopter Y later said that his company passed right overhead and asked if there was a sequence. I should have let everybody know the sequence instead of just assuming that Helicopter X had his company in sight and knew what the plan was.
Tower Controller described a conflict event when failing to insure the planned sequence was provided to pattern traffic.