Parts · Instruments and avionics

Clock

4 failure reports named the clock in the last ten years, 119 since 1995, most often on the Airbus A320; the condition most often found was "failed". 51 FAA approvals let 8 companies make a replacement clock, Ads/Transcoil holding the most (22).

Reports by year

Reports by year, as a table

	reports
1995	7
1996	6
1997	7
1998	13
1999	18
2000	3
2001	13
2002	19
2003	11
2004	6
2005	1
2006	1
2007	1
2010	1
2011	2
2012	1
2013	3
2014	1
2015	1
2019	1
2021	1
2023	1
2026	1

Which system the reports file it under last ten years

Instruments and avionics4

Reports by system, as a table

	reports
Instruments and avionics	4

Models most often reporting it last ten years

Airbus A3201Beechcraft 400 Beechjet1Bell 206 JetRanger and LongRanger1Boeing 7371

Models most reported, as a table

	reports
Airbus A320	1
Beechcraft 400 Beechjet	1
Bell 206 JetRanger and LongRanger	1
Boeing 737	1

How it failed the condition found, last ten years

failed2inoperative1unserviceable1

Conditions found, as a table

	reports
failed	2
inoperative	1
unserviceable	1

Approved replacement parts 51 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a clock and sell it as an approved part for the models named. These are the companies holding such approvals for a clock:

Ads/Transcoil 22Allard Industries INC, Aerospace Display Sys 9Davtron INC 8Aerosonic Corporation 6Smiths Industries/Aerospace 3Butler Avionics INC. 1Avcon Industries INC 1Astrotech CORP 1

For these models most: Piper PA-42 (15), Piper PA-46 Malibu, Mirage, Matrix and M-Class (6), Boeing 737 (6), Boeing 727 (5), Beechcraft 35 Bonanza and Debonair (5), Dornier Luftfahrt Gmbh 328 (4), Piper PA-32 Cherokee Six, Lance and Saratoga (3), Piper PA-31 Navajo and Chieftain (3), Piper PA-28 Cherokee, Warrior, Archer and Arrow (3), Beechcraft N35 (3), Beechcraft M35 (3), Beechcraft K35 Bonanza (3).

Maker	Part	Replaces	Fits	Granted	Status
Butler Avionics INC.	Replacement Clock/Clock with USB Port 90004003, 90004005	Modification Parts	Learjet 24, 24B/D/E/F, 25	2026-07-10	current
Avcon Industries INC	Clock/Clock with USB Port MDL 08501000	Modification Parts	Learjet Inc. 24, 24B/D/E/F, 25	2025-06-06	current
Ads/Transcoil	Clock AT4220P1	548-651	PIPER PA42, PA42-1000	2010-05-20	current
Ads/Transcoil	Clock AT420000	548-755	PIPER PA46-310P	2010-05-20	current
Ads/Transcoil	Clock AT4210P0	548-561	PIPER PA28-161, PA28-181, PA28-236	2010-05-20	current
Ads/Transcoil	Clock DNM-100-200-02	DNM-100-200-02	Boeing 737-300	2010-05-20	current
Ads/Transcoil	Clock AT6421R1	AT6421R1	DORNIER 328-100	2010-05-20	current
Ads/Transcoil	Clock AT4250P1	548-820	PIPER PA42-1000	2010-05-20	current
Ads/Transcoil	Clock AT6620P1	548-650	PIPER PA42	2010-05-20	current
Ads/Transcoil	Clock AT660100	548-756	PIPER PA46-310P	2010-05-20	current
Ads/Transcoil	Clock AT420100	548-516	PIPER PA31-T, PA31-T1, PA31-T3	2010-05-20	current
Ads/Transcoil	Clock AT6650P1	548-819	PIPER PA42-1000	2010-05-20	current
Davtron INC	Clock 811B-1	Modification Part	Raytheon A35, B35, C35	2007-03-01	current
Davtron INC	Clock MB800A	Modification Part	Raytheon A35, B35, C35	2007-03-01	current
Ads/Transcoil	Clock AT4251E1	AT4251E1C	Embraer EMB 120	2006-09-28	current
Ads/Transcoil	Clock AT42210H	AT42210H	Boeing/McDonnell... 369E, 369FF	2006-09-28	current
Ads/Transcoil	Clock AT420100	548-516	PIPER PA31-T, PA31-T1, PA31-T3	2005-07-06	current
Ads/Transcoil	Clock DNM-100-200-02	DNM-100-200-02	Boeing 737-300	2005-07-06	current
Ads/Transcoil	Clock AT6650P1	548-819	PIPER PA42-1000	2005-07-06	current
Ads/Transcoil	Clock AT6421R1	AT6421R1	DORNIER 328-100	2005-07-06	current
Ads/Transcoil	Clock AT6620P1	548-650	PIPER PA42	2005-07-06	current
Ads/Transcoil	Clock AT4210P0	548-561	PIPER PA28-161, PA28-181, PA28-236	2005-07-06	current
Ads/Transcoil	Clock AT4220P1	548-651	PIPER PA42, PA42-1000	2005-07-06	current
Ads/Transcoil	Clock AT660100	548-756	PIPER PA46-310P	2005-07-06	current
Ads/Transcoil	Clock AT420000	548-755	PIPER PA46-310P	2005-07-06	current
Ads/Transcoil	Clock AT4250P1	548-820	PIPER PA42-1000	2005-07-06	current
Aerosonic Corporation	Clock, Aircraft 87500-1145A	Boeing P/N 87500-1145	Boeing 727- 200 series	2003-07-02	current
Aerosonic Corporation	Clock, Aircraft 87500-1133A	Boeing P/N 87500-1133	Boeing 727- 200 series	2003-07-02	current
Smiths Industries/Aerospace	Clock 2620-02-1	Boeing S231W130-2	Boeing 777-200 Series	1998-05-27	current
Davtron INC	Clock MDL 800	Modification Part	Beech Raytheon) (35, A35, B35	1998-05-13	current
Davtron INC	Clock MDL MB800	Modification Part	Beech Raytheon) (35, A35, B35	1998-05-13	current
Davtron INC	Clock MDL 811B	Modification Part	Beech Raytheon) (35, A35, B35	1998-05-13	current
Smiths Industries/Aerospace	Clock 2610-07-1	Boeing 60B00303-105	Boeing 737-700, -800 Series	1998-04-19	current
Davtron INC	Clock M877	M877	Dassault Aviation Mystere Falcon 50 and Mystere Falcon 900	1997-09-30	current
Davtron INC	Clock M850-5V-G, M850A-5V-G	Gulfstream Aerospace 1159SCAV409-1, -2	Gulfstream GIV	1997-09-30	current
Aerosonic Corporation	Clock, Aircraft Mechanical 12 Minute Elapsed Time 87500-1135A	Boeing 87500-1135	Boeing 727-100, -200	1997-02-19	current
Astrotech CORP	Clock AT6421R1	Dornier AT6421R1	Dornier-Werke 328-100	1995-05-29	current
Davtron INC	Clock 811B24	7SC0361	deHavilland Dash-8 Series 100 (Model 101, 102,...	1995-01-19	current
Aerosonic Corporation	Clock 88000-4102A	Boeing 10-60715-6	Boeing 727-200, 737-100, -200	1994-08-10	current
Aerosonic Corporation	Clock 88000-4103A	Boeing 10-60715-4	Boeing 727-200, 737-100, -200	1994-08-10	current
Aerosonic Corporation	Clock 87500-1138A	Clock 87500-1138	McDonnell Douglas DC-9 Series	1993-06-24	current
Allard Industries INC, Aerospace Display Sys	Clock AT6650P1	Piper 548-819	Piper PA-42-1000	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT420000	Piper 548-755	Piper PA-46-310P	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT4210P0	Piper 548-561	Piper PA-28-161, PA-28-181, PA-28-236	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT660100	Piper 548-756	Piper PA-46-310P	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT6421R1	Dornier AT6421R1	Dornier-Werke 328-100	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT4220P1	Piper 548-651	Piper PA-42, PA-42-1000	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT420100	Piper 548-516	Piper PA-31-T, PA-31-T1, PA-T3	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT4250P1	Piper 548-820	Piper PA-42-1000	1992-12-31	current
Allard Industries INC, Aerospace Display Sys	Clock AT6620P1	Piper 548-650	Piper PA-42	1992-12-31	current
Smiths Industries/Aerospace	Clock 2600-04-1	Boeing 60B00303-104	Boeing 737-200, -300	1991-06-18	current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.