Airworthiness Directive Lookup Free FAA AD search by N-number, make or model
Find the FAA airworthiness directives that may apply to an aircraft: 12,857 ADs from the Federal Register since 1995, through Oct 1, 2026, each with its applicability text and the official document. Free, no account.
N501ZD is a 1973 Cessna 500 Citation in the FAA registry (aircraft page). Matched on type certificate model 500.
RESULTS
13 ADs in effect may apply to N501ZD
- In effect13
- Recurring4
- Superseded or removed3
Informational only. These are FAA airworthiness directives whose published applicability names this make and model. Whether an AD applies to a particular aircraft depends on its serial number, installed engines, propellers, parts and modifications, and some ADs listed here will not apply. This list is not the official AD record and not a compliance determination: confirm applicability and compliance against the FAA’s Dynamic Regulatory System and the aircraft’s records with a certificated mechanic or inspector. Covers ADs published in the Federal Register since 1995, through Oct 1, 2026; older ADs, and engine, propeller and appliance ADs that do not name the aircraft, are not included.
Also show 3 superseded or removed N501ZD’s registration record
- AD 2025-07-01 One-time
Thommen Aircraft Equipment AG Digital Air Data Computers
This AD was prompted by occurrences of AC32 Digital ADCs that stopped functioning due to the power module failing at temperatures below -20 degrees Celsius.
Applicability, as the AD words it
(1) This AD applies to THOMMEN AIRCRAFT EQUIPMENT AG (THOMMEN) AC32 Digital Air Data Computers (ADCs) having an affected part as defined in paragraph (f)(1) of this AD. (2) This appliance is installed on, but not limited to, the following aircraft models specified in table 1 to paragraph (c)(2) of this AD, certificated in any category. Table 1 to Paragraph (c)(2)--Applicable Aircraft Models Type certificate holder Aircraft model Airbus Defense and Space S.A. (type CN-235, CN-235-100, CN-235-200, certificate previously held by and CN-235-300. Construcciones Aeronauticas, S.A.). Airbus Helicopters: AS332C, AS332C1, AS332L, AS332L1, AS3323L2. Airbus Helicopters Deutschland GmbH EC635T2+. (AHD). Bell Textron Inc: 212, 412, and 412EP. Bombardier Inc: CL-600-1A11 (600). Columbia Helicopters Inc: 107-II, 234. General Atomics Aerotek Systems GmbHl 228-100, 228-101, 228-200, 228- (type certificate formerly held by 201, 228-202, and 228-212. DORNIER LUFTFAHRT Inc.). Gulfstream Aerospace LP: Westwind Astra 1124 (serial numbers 004-0410). International Air Response: C-130A. Kawasaki Heavy Industries, Limited: KV107-II. Leonardo S.p.a: A109, A10A, A109A II, A109C, A109K2, A109S, 1099SP, AW139, and AW189. Textron Aviation Inc: 200, 300, 500, 501, 550, and 551. Viking Air Limited: CL-215-6B11 (CL-215T Variant). (3) This appliance is approved for installation and could be installed on various aircraft modified by Supplemental Type Certificate (STC) No. SR09595RC or ST01523WI.
- AD 2015-17-12 Recurring
Cessna Aircraft Company Airplanes
This AD was prompted by reports of smoke and/or fire in the tailcone caused by sparking due to excessive wear of the brushes in the A/C motor.
Applicability, as the AD words it
This AD applies to the Cessna Aircraft Company airplanes, certificated in any category, identified in table 1 to paragraph (c) of this AD, that have an air conditioning (A/C) system installed via a Cessna Aircraft Company supplemental type certificate (STC) identified in paragraph (c)(1), (c)(2), (c)(3), or (c)(4) of this AD. (1) SA3849SW (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/029C5719AD18E79C86257C1A0069742C?OpenDocument&Highlight=sa3849sw). (2) SA7580SW (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/7C9B0FB7D5923D4986257C1A0069E2C0?OpenDocument&Highlight=sa7580sw). (3) SA7753SW (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/A78233CBB3314BAF86257C1A0069D128?OpenDocument&Highlight=sa7753sw). (4) SA8918SW (http://rgl.faa.gov/Regulatory_and_Guidance_Library/rgstc.nsf/0/5FAD7ABA3EAA464C86257C1A0069F239?OpenDocument&Highlight=sa8918sw). Table 1 to Paragraph (c) of this AD--Affected Airplane Models and Serial Numbers (S/Ns) Cessna aircraft company airplane models S/Ns Model 500 and 501 airplanes: 0001 through 0689 inclusive. Model 550 and 551 airplanes: 0002 through 0733 inclusive, and 0801 through 1136 inclusive. Model S550 airplanes: 0001 through 0160 inclusive. Model 560 airplanes: 0001 through 0707 inclusive, and 0751 through 0815 inclusive. Model 650 airplanes: 0200 through 0241 inclusive, and 7001 through 7119 inclusive.
- AD 2013-09-11 Recurring
Cessna Aircraft Company Airplanes
This AD was prompted by multiple reports of smoke and/or fire in the tailcone caused by sparking due to excessive wear of the brushes in the air conditioning (A/C) motor.
Applicability, as the AD words it
This AD applies to the following Cessna Aircraft Company airplanes, certificated in any category. (1) Model 500 and 501 airplanes, serial numbers (S/N) 0001 through 0689 inclusive. (2) Model 550 and 551 airplanes, S/Ns 0002 through 0733 inclusive, and 0801 through 1136 inclusive. (3) Model S550 airplanes, S/Ns 0001 through 0160 inclusive. (4) Model 560 airplanes, S/Ns 0001 through 0707 inclusive, and 0751 through 0815 inclusive. (5) Model 560XL airplanes, S/Ns 5001 through 5300 inclusive. (6) Model 650 airplanes, S/Ns 0200 through 0241 inclusive, and 7001 through 7119 inclusive.
- AD 2007-11-17 One-time
Cessna Model 500, 501, 550, 551, S550, 560, 560XL, and 750 Airplanes
Applicability, as the AD words it
This AD applies to Cessna Model 500, 501, 550, 551, S550, 560, 560XL, and 750 airplanes, certificated in any category; as identified in the service bulletins specified in Table 1 of this AD. Table 1.--Cessna Service Bulletins Cessna Service Bulletin Revision Date Cessna model SB500-26-02, including Service 1: July 7, 2005: 500/501 airplanes. Bulletin Supplemental Data, dated April 1, 2005. SB500-26-02: Original: April 1, 2005: 500/501 airplanes. SB550-26-05: Original: April 1, 2005: 550/551 airplanes. SB560-26-01: Original: April 1, 2005: 560 airplanes. SB560XL-26-02: 1: December 22, 2004: 560XL airplanes. SB750-26-05: Original: November 24, 2004: 750 airplanes. SBS550-26-02: Original: April 1, 2005: S550 airplanes.
- AD 2006-06-03 One-time
Cessna Model 500, 501, 550, S550, 551, and 560 Airplanes
This AD was prompted by a report of a chafed electrical wiring harness, which was arcing inside the fuel tank.
Applicability, as the AD words it
This AD applies to the Cessna airplanes listed in Table 1 of this AD, certificated in any category. Table 1.--Applicability Airplane model(s) Serial Nos. 500 and 501: 0001 through 0689 inclusive. S550: 0001 through 0160 inclusive. 550 and 551: 0002 through 0733 inclusive. 550: 0801 through 1075 inclusive. 560: 0001 through 0648 inclusive.
- AD 2004-09-05 Recurring
Cessna Model 500, 501, 550, and 551 Airplanes
To prevent jamming of the wheel/tire assembly, which could result in a loss of directional control or braking performance upon landing.
Applicability, as the AD words it
Model 500 and 501 airplanes, serial numbers 0001 through 0689 inclusive, and Model 550 and 551 airplanes, serial numbers 0002 through 0733 inclusive; certificated in any category; equipped with BFGoodrich brake assembly part number (P/N) 2-1528-6 or 2-1530-4.
- AD 2004-08-15 One-time Appliance
Goodrich Avionics Systems, Inc. TAWS8000 Terrain Awareness Warning System
Applicability, as the AD words it
This AD affects all airplane models and serial numbers, certificated in any category, that incorporate a Goodrich TAWS8000 terrain awareness warning system (TAWS), part number (P/N) 805- 18000-001, with "Mod None", "Mod A", or "Mod B" hardware installed. This list of airplanes that have the TAWS8000 TWAS installed includes, but is not limited to, the following airplanes. Airplanes that are not in this list and have the TAWS installed through field approval or other methods are still affected by this AD: Company Models Cessna Aircraft Company: 421, 500, 501, 525, 525A, 550, 551, 650, and S550 DASSAULT AVIATION: Mystere-Falcon 20 series Gulfstream Aerospace LP: 1125 Westwind Astra Raytheon Aircraft Company: 100, 200, 300, 400A, and F90 Sabreliner Corporation: NA-265 The New Piper Aircraft Inc: PA-42-1000
- AD 2004-05-24 One-time Engine
Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 Series Reciprocating Engines
We are issuing this AD to prevent the loss of all engine power and possible forced landing.
Applicability, as the AD words it
This AD applies to all Lycoming Engines (Formerly Textron Lycoming) AEIO-540, IO-540, LTIO-540, O-540, and TIO-540 series reciprocating engines with crankshaft gear retaining bolts, part number (P/N) STD-2209 installed, except: (1) O-540-F series engines to which AD 99-03-05 applies and on which the bolt has not been subsequently replaced, and (2) Engines on which the bolt was installed during original assembly or was replaced by Lycoming as specified in Service Bulletin (SB) 554 after November 10, 1998, and (3) Engines with a bolt P/N STD-2209 supplied as part of a bolt replacement kit 05K19987, 05K23325, 05K23326, 05K23327, 05K23335, or 05K23336, and (4) Engines with single-drive dual magnetos. (5) These engines are installed on, but not limited to the following aircraft: Aero Commander. (500), (500-B), (500-E), (500-U) Aero Mercantil. Gavilan. Aerofab. Renegade 250. Bellanca Aircraft. Aries T-250 Britten-Norman. (BN-2). Cessna Aircraft. Skylane C-182, Stationair C-206, Turbo Skylane T182T, Turbo Stationair T-206 Christen. Pitts (S-2S), (S-2B). Commander Aircraft. 114TC, 114B DeHavilland. (DH-114-2X) Dornier. (DO-28-B1) Evangel-Air. Extra-Flugzeugbau. Extra 300. Found Bros. (FBA-2C), Centennial (100) Gippsland. GA-200. Helio. Military (H-250). King Engineering. Angel. Maule. MT-7-260, M-7-260, MX-7-235, MT-7-235, M7-235, Star Rocket (MX-7-235), Super Rocket (M-6-235), Super Std. Rocket (M-7-235). Mooney Aircraft. "TLS" M20M. Moravan. Zlin-50L Pilatus Britten-Norman. Islander (BN-2A-26), Islander (BN-2A-27), Islander II (BN-2B-26), Islander (BN-2A-21), Trislander (BN-2A-Mark III- 2), Islander (BN-2B). Piper Aircraft. 700P Aerostar, Aerostar 600A, Aerostar 601B, Aerostar 601P, Apache (PA-23 "235"), Aztec (PA-23 "250"), Aztec (PA-23 "250"), Comanche (PA-24 "250"), Comanche (PA-24 "260"), Aztec F, Aztec C (PA-23 "250", Cherokee (PA-24 "250"), Cherokee (PA-28 "235"), Cherokee Six (PA-32 "260", Cherokee Six (PA-32-300). "LANCE", Comanche (PA-24 "150"), Comanche (PA-24 "250"), Comanche (PA-24), Comanche (PA-24 "260"), Comanche 260, Mirage (PA-46-350P, Navajo (PA-31), Navajo (PA-31-300), Navy Aztec (PA-23 "250"), Pawnee (PA-24 "235"), Pawnee (PA-25 "260"), Saratoga (PA-32-300), Brave 300, Sequoia 602P, T-1020, T35, Turbo Aztec (PA-23-250), Turbo Saratoga TC (PA-32-301T) S.O.C.A.T.A. Rallye 235CA., Rallye 235GT, Rallye 235C, TB-20
- AD 2001-23-17 One-time Appliance
GARMIN International GNS 430 Units
Applicability, as the AD words it
This AD applies to the GNS 430 units that are specified in paragraph (a)(1) of this AD and are installed on aircraft. These GNS 430 units are installed in, but not limited to, aircraft that are certificated in any category and presented in paragraph (a)(2) of this AD: (1) GNS 430 Units, part number 011-00280-00: serial numbers 9630001, 96300002, 96300017, 96300028, 96300034, 96300040, 96300068, 96300104, 96300108, 96300122, 96300125, 96300130, 96300142, 96300149, 96300161, 96300165, 96300218, 96300222, 96300232, 96300269, 96300272, 96300308, 96300333, 96300340, 96300348, 96300354, 96300369, 96300372, 96300382, 96300394, 96300411, 96300413, 96300429, 96300437, 96300451, 96300484, 96300485, 96300489, 96300504, 96300506, 96300513, 96300522, 96300549, 96300563, 96300585, 96300587, 96300618, 96300621, 96300624, 96300628, 96300641, 96300653, 96300664, 96300713, 96300734, 96300756, 96300766, 96300781, 96300785, 96300786, 96300808, 96300831, 96300837, 96300842, 96300846, 96300866, 96300870, 96300872, 96300899, 96300916, 96300923, 96300925, 96300929, 96300941, 96300961, 96300984, 96300987, 96301021, 96301108, 96301130, 96301280, and 96301296 through 96303200. (2) Aircraft with the GNS 430 Unit Installation (other aircraft could have field approval installations): TC holder Airplane models Cessna Aircraft Company: 172, 182, 206, 208, 210, 401, 402, 404, 406, 411, 414, 414A, 421A, 421B, 421C, 425, 441, 500, 550, S550, 552, 560, 560XL, 501, 525, and 551. Mooney Aircraft: M20, M20A, M20B, M20C, M20D, M20E, M20F, M20G, M20J, M20K, M20L, M20M, M20R, M20S, and M22. Raytheon Aircraft Company: Beech Models E33, F33, G33, E33A, F33A, E33C, F33C, 35, 35R, A35, B35, B35TC, C35, D35, E35, F35, G35, H35, J35, K35, M35, N35, P35, S35, V35, V35TC, V35A, V35A-TC, V35B, V35B-TC, 36, A36, A36TC, 50, B50, C50, D50, D50A, D50B, D50C, D50E, E50, F50, G50, H50, J50, 60, A60, B60, 65-90, 65-A90, B90, C90, C90A, C90B, E90, F90, 100, A100, B100, 95-55, 95-A55, 95-B55, 95-C55, D-55, E55, 58, 58P, and 58TC. Socata: TBM 700. The New Piper Aircraft, Inc.. J3C-40, J3C-50, J3C-50S (Army L-4, L-4B, L-4H, and L-4J), J3C-65 (Navy NE-1 and NE-2), J3C-65S, J3F-50, J3F-50S, J3F-60, J3F-60S, J3F-65 (Army L-4D), J3F-65S, J3L, J3L-S, J3L-65 (Army L-4C), J3L-65S, J4, J4A, J4A-S, J4E (Army L-4E), J5A (Army L-4F), J5A-80, J5B (Army L-4G), J5C, AE-1, HE-1, PA-11, PA-11S, PA-12, PA-12S, PA-14, PA-15, PA-16, PA-16S, PA- 17, PA-18, PA-18A, PA-18A (Restricted), PA-18S, PA-18-"105" (Special), PA-18S- "105" (Special), PA-18-"125" (Army L- 21A), PA-18AS-"125", PA-18S-"125",
- AD 98-25-02 One-time Appliance
BFGoodrich Avionics Systems, Inc. SKYWATCH SKY497 Installations with a Top-Mounted Antenna
To prevent the display of target indicators on the wrong side of the aircraft caused by an internal component failure in the SKY497 installations with a top-mounted antenna, which could result in the pilot making an incorrect initial maneuver based on the displayed information while trying to visually acquire the aircraft.
Applicability, as the AD words it
SKYWATCH SKY497 installations with a top-mounted antenna that are installed on, but not limited to, the following aircraft, all serial numbers, certificated in any category: Manufacturer Aircraft models and/or series Raytheon: Beech 90, 100, 200, and 300 Series. Cessna: 172, 182, 206, 208, 210, 300, 400, and 500 Series. Piper: PA-23, PA-31-360, PA-31T, PA-32, PA-34, PA-42, and PA-46. Hawker: HS-700 and HS-800. Mitsubishi: MU-2 Series. Dassault: F10. Mooney: M20 Series. Bombardier: DHC-6 Series. West- wind: 1124. Bell: 407. Eurocopter: AS365. Socata: TBM700.
- AD 98-04-38 One-time
Cessna Model 500, 501, 550, 551, and 560 Series Airplanes
Applicability, as the AD words it
Model 500, 501, 550, 551, and 560 series airplanes equipped with pneumatic deicing boots, certificated in any category.
- AD 95-25-10 One-time
Cessna Model 441, 500, 550, and 560 Series Airplanes
To prevent cracking and subsequent failure of the outflow/safety valves, which could result in rapid decompression of the airplane.
Applicability, as the AD words it
Model 441, 500, 550, and 560 series airplanes; equipped with Allied Signal outflow/safety valves; as identified in Allied Signal Aerospace Service Bulletins 103576-21-4054, 103576-21- 4056, and 103648-21-4055, all dated January 30, 1995; certificated in any category.
- AD 95-11-08 Recurring Propeller
Hartzell Propeller Inc. Models HC-92WK- ( ) and HC-92ZK-( ) Propellers
To prevent propeller blade separation, which could result in loss of control of the aircraft.
Applicability, as the AD words it
Hartzell Propeller Inc. Models HC-92WK-( ) and HC-92ZK-( ) propellers, installed on but not limited to the following aircraft: Aerostar Aircraft Corp. (formerly Ted Smith Aerostar) Model Aerostar 360; Air & Space America, Inc. Model 18A; Aircraft Acquisition Corp. (formerly Helio) Models H-250, 500; Beech Models 95, B95, B95A, D95A, E95; Cessna Models 172, 175, 175A; Found Brothers Aviation Ltd. Models FBA 100, FBA-2C; Kwad Company Model Super-V; Mooney Aircraft Corp. Model M20A; Piper Models PA-23, PA- 24, PA-25; Procaer Model F15/B; Revo Inc. Models C2, Lake LA-4; and Simmering Graz Pauker A.G. Model SGP-222.
Radar reads the logbooks and ties each AD to the entries that show how and when it was complied with, with recurring ADs due by date and hours.
QUESTIONS
AD lookup questions
Sources: FAA final rules under 14 CFR part 39, from the Federal Register; make and model from the FAA aircraft registry. The FAA’s Dynamic Regulatory System holds the official AD list.
What is an airworthiness directive (AD)?
An airworthiness directive is a legally enforceable rule the FAA issues under 14 CFR part 39 when it finds an unsafe condition in an aircraft, engine, propeller or appliance that is likely to exist in others of the same design. It says which products it applies to and what must be done, and by when: an inspection, a part replacement, a modification or a limitation. No one may operate a product to which an AD applies except in accordance with it.
How do I look up the ADs for my aircraft?
Type the N-number, or the make and model, into the box above. Radar finds the aircraft's make and model in the FAA registry and lists every AD published in the Federal Register whose applicability names it, newest first, with the AD's own applicability text and a link to the official document. The FAA's Dynamic Regulatory System (drs.faa.gov) holds the official list.
Does every AD in the results apply to my aircraft?
Not necessarily. An AD can be limited to serial number ranges, to aircraft with certain parts or modifications installed, or to a configuration. The results are ADs that may apply because they name the make and model. A certificated mechanic or inspector determines applicability against the aircraft's serial number and records, and records how each applicable AD was complied with.
What is the difference between a recurring and a one-time AD?
A one-time AD is complied with once, for example by replacing a part. A recurring (repetitive) AD requires an action again at an interval, such as an inspection every 100 hours or every 12 months, until a terminating action ends it. Radar marks an AD Recurring when its text requires repetitive actions; always read the AD for the intervals.
What does superseded mean?
When the FAA replaces an AD with a new one, the old AD is superseded: its requirements are carried into, or replaced by, the new AD. Results show the ADs in effect by default; superseded and removed ADs can be shown for the history.
Where does this data come from?
The Federal Register, where the FAA publishes every AD as a final rule. Radar reads each one from the Federal Register API (12,857 ADs since 1995) and refreshes the list every weekday. Make and model come from the FAA aircraft registry. ADs issued before 1995 are not in the Federal Register's online edition and are not included.
Are engine and propeller ADs included?
Only when their applicability names the aircraft. Most engine and propeller ADs name the engine or propeller model, so check those by the installed engine and propeller models. Appliance ADs that list the aircraft among those the appliance can be installed on are included and marked Appliance.
Know which ADs apply, and where each one was signed off.
Radar reads every logbook page, typed or handwritten, and builds one searchable record per tail: times, inspections, ADs and components, each tied to the page it came from.