OpenAirDocs.org

Learjet 31A

Open the Markdown

Aircraft model · Fixed wing multi engine · Airplane · registry code 5170531

Manufacturer (registry)
LEARJET INC
Model
31A
Registry code
5170531
Registered
104 aircraft
Type
Fixed wing multi engine
Engines
2 · Turbo-fan
Seats
10
Weight class
12,500 to 19,999 lb
Certification
Type certificated
Data sheet
TCDSA10CE
Holder
Learjet Inc.

Model codes come from the FAA registry’s reference file. ADs are matched to them by model name and maker.

On this page

Aircraft by year built · 180

1991Registered nowDeregistered2026

Airworthiness directives that may apply · 13

ADs whose products match this airframe model. Each AD’s applicability may narrow it by serial number, part number or configuration.

1992In forceSuperseded2026
Query with SQL
duckdb -csv -c "SELECT d.ad_number, d.status, d.subject, d.effective_date
  FROM 'https://openairdocs.org/data/latest/faa_directive.parquet' d
  WHERE d.ad_id IN (SELECT ad_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_directive.parquet' WHERE aircraft_model_code IN ('5170531'))
  ORDER BY coalesce(d.effective_date, d.publication_date, d.issue_date) DESC, d.ad_number DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

Information bulletins that may apply · 4

Query with SQL
duckdb -csv -c "SELECT s.saib_number, any_value(s.title) AS title, max(s.issue_date) AS issue_date, any_value(s.status) AS status
  FROM 'https://openairdocs.org/data/latest/faa_saib.parquet' s
  WHERE s.saib_id IN (SELECT saib_id FROM 'https://openairdocs.org/data/latest/faa_aircraft_model_saib.parquet' WHERE aircraft_model_code IN ('5170531'))
  GROUP BY s.saib_number ORDER BY issue_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

Registered aircraft · 104

N121LJN121lj LLC · Elmira, NYBuilt 1996 · S/N 121N125FSAircraft Trustee Services Inc Trustee · Dover, DEBuilt 1996 · S/N 125N127VLE D Santos & Associates LLC Trustee · Wilmington, DEBuilt 1991 · S/N 036
See all 104 registered aircraft
Query with SQL
duckdb -csv -c "SELECT n_number, serial_number, year_manufactured, status, registrant_name, registrant_city, registrant_state
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet'
  WHERE aircraft_model_code IN ('5170531')
  ORDER BY n_number"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

STCs approved for this model · 104

STC SA00237SEInstallation of emergency medical stretcher, oxygen, and electrical systems.LifePort, LLCSTC SA01213CHInstall air ambulance conversion in accordance with Spectrum Aeromed Inc. Drawings as listed on AML SA01213CH, or later FAA approved revision.Spectrum Aeromed LLC dba Spectrum AeromedSTC SA01452CHInstallation of an air ambulance conversion kit.Med-Pac Inc.
See all 104 STCs
Query with SQL
duckdb -csv -c "SELECT s.stc_number, s.description, s.holder, s.status, s.status_date
  FROM 'https://openairdocs.org/data/latest/faa_stc.parquet' s
  WHERE s.stc_number IN (SELECT stc_number FROM 'https://openairdocs.org/data/latest/faa_stc_model.parquet' WHERE model_key = '31A')
  ORDER BY s.status = 'Current' DESC, s.stc_number"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

NTSB investigations · 2

Aircraft matched to this model through the registry, by N-number and event date.

Defining event, 2008 on

Of 1 case NTSB coded with a defining event. All defining events

In the probable cause, 2008 on

Findings NTSB made part of the probable cause. A case can have several. All findings

First occurrence, 1982 to 2007

Of 1 case with NTSB’s older coding, defined in its coding manual.

NTSB GAA18CA155Accident · No injuriesData collectionFinal reportLearjet 31 · Mount Pleasant, MIThe airplane’s collision with deer during the landing roll.Mar 10, 2018 · N500MP · Substantial damageNTSB FTW03LA154Accident · Minor injuriesLimited investigationFinal reportBeech BE-300 · Houston, TXThe severed hydraulic brake hoses induced a loss of braking action, which resulted in the pilot's failure to control the aircraft.May 18, 2003 · N2SM · Substantial damage
Query with SQL
duckdb -csv -c "SELECT c.\"ntsbNumber\", c.\"eventDate\", c.\"eventType\", c.\"eventCity\", c.\"eventStateOrRegion\", a.n_number, a.\"aircraftMake\", a.\"aircraftModel\", c.\"highestInjuryLevel\", c.\"totalFatal\", c.\"completionStatus\", c.report_url
  FROM 'https://openairdocs.org/data/latest/ntsb_aircrafts.parquet' a JOIN 'https://openairdocs.org/data/latest/ntsb_case_detail.parquet' c ON c.\"mKey\" = a.case_mkey
  WHERE a.aircraft_model_code IN ('5170531')
  ORDER BY c.\"eventDate\" DESC, c.\"ntsbNumber\" DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

FAA incident reports · 17

Matched to this model through the registry, by N-number and event date.

Incident 20220122000819ILearjet 31A · San Antonio, TXOn January 22, 2022, 1620 CST, a lear jet 31A aircraft landed at San Antonio international airport (sat), runway 13R. Weather was clear and winds light. During landing, nose landing wheel was not centered (90 degrees out). Aircraft came to rest approximately…Jan 22, 2022 · N524HC · Minor damageIncident 20210404001319ILearjet 31A · Juneau, AKOn 04/04/2021, during departure from Juneau international airport (jnu) runway 08, passing through 1000', aircraft N552LM struck a bald eagle with the outboard section of the aircraft's right wing. Not knowing the extent of any possible damage, the flight…Apr 4, 2021 · N552LM · Minor damageIncident 20190108007339ILearjet 31A · St Petersburg, FLN929JH experienced l/h wind screen failure in the form of a crack, approximately 18 inches in length during flight. Windshield was replaced. Cause of crack was undetermined.Jan 8, 2019 · N929JH · Minor damage
See all 17 incident reports
Query with SQL
duckdb -csv -c "SELECT report_number, event_date, event_type, city, state, aircraft_make, aircraft_model, aircraft_damage, fatal_injuries, n_number
  FROM 'https://openairdocs.org/data/latest/faa_incident_report.parquet'
  WHERE aircraft_model_code IN ('5170531')
  ORDER BY event_date DESC, report_number DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

Service difficulty reports · 128

SDR EE0A202605310001Starter Gen · failedRT ENGINE FAILD TO RATATE ON START. REPLACED RT STARTER GENERATOR.May 31, 2026 · N631KA · Lear 31A · Starter-GeneratorSDR S2KA202604290001Indication Sys · faultedMOMENTARY LOSS OF AIRSPEED AND ALTIMETER. HAPPENED 2 TIMES IN FLIGHT.Apr 28, 2026 · N724SA · Lear 31A · Navigation SystemSDR S2KA251116412SWAhrs · faultyAHS 1 & 2 FAILURE. HAPPENED IN CRUISE, AHS 1 & 2 ANNUNCIATORS. CAME BACK TO LIFE AFTER WE WERE ALREADY HEADING BACK TO BASE. WHILE TROUBLESHOOTING THIS ISSUE #2 SYMBOL GENERATOR FAILED PN 066-04021-1111 OFF SN 4932, ON SN 2635. BOMBARDIER TECHNICAL SUPPORT RECNov 16, 2025 · N412SW · Lear 31A · Integrated Flight System
See all 128 difficulty reports
Query with SQL
duckdb -csv -c "SELECT sdr_id, difficulty_date, n_number, aircraft_make, aircraft_model, part_name, part_condition, jasc_code, discrepancy
  FROM 'https://openairdocs.org/data/latest/faa_service_difficulty_report.parquet'
  WHERE aircraft_model_key = '31A'
  ORDER BY difficulty_date DESC"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.

The same model under other registry codes

Amateur-built copies and renamed makers get their own codes.

Lindstrand Balloons 31A5 registered aircraftRegistry code 5180011Balloon Repairs Of East Texas 31A2 registered aircraftRegistry code 05605S0Gauthier Guy G 31A1 registered aircraftRegistry code 05618IXBalloon Repair Of East Texas 31A0 registered aircraftRegistry code 05615EM
Query with SQL
duckdb -csv -c "SELECT m.code, m.manufacturer, m.model, count(g.n_number) AS aircraft
  FROM 'https://openairdocs.org/data/latest/faa_aircraft_model.parquet' m LEFT JOIN 'https://openairdocs.org/data/latest/faa_aircraft_registration.parquet' g ON g.aircraft_model_code = m.code
  WHERE m.match_key = '31A' AND m.code NOT IN ('5170531')
  GROUP BY ALL
  ORDER BY aircraft DESC
  LIMIT 12"

Prints the whole list as CSV. It reads the release’s Parquet files over HTTPS, so there’s nothing to download first. Install DuckDB to run it.