| Part No | Type | A/C Type | NSN | Description | Comment | Image |
| Digital clock, which has been used as the time source in conjunction with magnetic tape flight recorders since 1962, is designed for cockpit mounting and can be supplied with or without chronograph or state-of-wind indicator. Performance is better than 2.5 sec/day in any attitude; output is 13-bit b.c.d. parallel. | Installed in RAF, Air Canada and PIA aircraft. | |