After attachment, it fires a shaped head into the skin of the aircraft followed by auditory or visual disrupting agents. Incredibly high-pitched sound, or gas, or both.
13 seconds sound clip from Airwolf (1984) - Bite of the Jackal (S1.E3) action military drama television series.
You can hear this line at 00:23:29.337 in the Blu-ray version of the TV Series.
Quote context
[...]
- Comes back? But what if he does not come back, huh? I mean, by now he knows it's a trap.
- He also knows that I'm not wining and dining his friend out there.
- If you couldn't take him today, what makes you think you can do it tomorrow?
- I didn't get a chance today to use the Leech.
- Leech?
- Where do you think this Hawke is now?
- Well, he'll need to repair the rotor.
- There are salt and mining camps scattered all through this area.
- You don't know what's down there.
- It doesn't look deserted. Where are all the people?
[...]