MCAS
E552017
MCAS (Maneuvering Characteristics Augmentation System) is an automated flight-control feature on the Boeing 737 MAX designed to adjust the aircraft’s nose-down pitch under certain conditions to improve handling characteristics.
All labels observed (1)
| Label | Occurrences |
|---|---|
| MCAS canonical | 4 |
How this entity was disambiguated
This entity first appeared as the object of triple T5848609 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: MCAS Context triple: [Boeing 737 MAX 8, hasSoftwareSystem, MCAS]
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A.
Massachusetts Comprehensive Assessment System
The Massachusetts Comprehensive Assessment System is the statewide standardized testing program used to measure student achievement and school performance in Massachusetts public schools.
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B.
SLC
SLC is the three-letter IATA airport code for Salt Lake City International Airport, a major air travel hub serving Salt Lake City, Utah.
-
C.
SLC
SLC is a collegiate athletic conference in the NCAA Division I primarily comprising universities from the South Central United States.
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D.
SLC
SLC is the commonly used abbreviation for the UK government-owned Student Loans Company, which administers student loans and grants for higher and further education.
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E.
SLC
SLC is an abbreviation commonly used for the Student Learning Centre, a dedicated space or service that supports students’ academic success and skill development.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: MCAS Target entity description: MCAS (Maneuvering Characteristics Augmentation System) is an automated flight-control feature on the Boeing 737 MAX designed to adjust the aircraft’s nose-down pitch under certain conditions to improve handling characteristics.
-
A.
Massachusetts Comprehensive Assessment System
The Massachusetts Comprehensive Assessment System is the statewide standardized testing program used to measure student achievement and school performance in Massachusetts public schools.
-
B.
SLC
SLC is the three-letter IATA airport code for Salt Lake City International Airport, a major air travel hub serving Salt Lake City, Utah.
-
C.
SLC
SLC is a collegiate athletic conference in the NCAA Division I primarily comprising universities from the South Central United States.
-
D.
SLC
SLC is an abbreviation commonly used for the Student Learning Centre, a dedicated space or service that supports students’ academic success and skill development.
-
E.
SLC
SLC is a former high-energy electron–positron linear collider at the SLAC National Accelerator Laboratory that was used for precision studies of the Z boson and electroweak interactions.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
flight control system
ⓘ
software-controlled augmentation system ⓘ |
| abbreviationOf | Maneuvering Characteristics Augmentation System ⓘ |
| activationCondition |
flaps up configuration
ⓘ
high angle of attack ⓘ manual flight ⓘ |
| associatedWith | Boeing 737 MAX safety crisis ⓘ |
| canBeOverriddenBy |
manual stabilizer trim wheel
ⓘ
pilot use of stabilizer trim cutout switches ⓘ |
| certificationAuthority | Federal Aviation Administration ⓘ |
| contributedToAccident |
Ethiopian Airlines Flight 302
ⓘ
Lion Air Flight 610 ⓘ |
| controls | stabilizer trim ⓘ |
| controversy |
delegation of certification tasks to manufacturer
ⓘ
insufficient disclosure to pilots before accidents ⓘ |
| designCharacteristic |
automatic repeated nose-down trim commands
ⓘ
no dedicated cockpit annunciation in original design ⓘ |
| designedTo |
adjust aircraft nose-down pitch
ⓘ
enhance pitch stability ⓘ improve handling characteristics ⓘ |
| developedForAircraftModel | Boeing 737 MAX ⓘ |
| documentationIssue | limited mention in original flight crew operations manual ⓘ |
| fullName | Maneuvering Characteristics Augmentation System ⓘ |
| implementation | flight control computer software ⓘ |
| inputSensor | angle of attack sensor ⓘ |
| introducedOn |
Boeing 737 MAX 8
ⓘ
Boeing 737 MAX 9 ⓘ |
| manufacturer | Boeing ⓘ |
| operatesOn | horizontal stabilizer ⓘ |
| operationalStatus | modified and active on recertified Boeing 737 MAX aircraft ⓘ |
| postAccidentChange |
enhanced pilot training requirements
ⓘ
limited authority over stabilizer movement ⓘ limited number of repeated activations ⓘ updated flight crew procedures ⓘ use of two angle of attack sensors for activation logic ⓘ |
| primaryPurpose |
compensate for aerodynamic changes due to larger engines
ⓘ
make 737 MAX handling similar to earlier 737 models ⓘ |
| regulatoryResponse |
EASA additional certification conditions
ⓘ
FAA software modification requirements ⓘ global grounding of Boeing 737 MAX fleet in 2019 ⓘ |
| relatedConcept |
augmentation system
ⓘ
fly-by-wire control laws ⓘ stability augmentation ⓘ |
| relatedTo | Boeing 737 MAX design changes ⓘ |
| riskFactor | single point of failure in original design ⓘ |
| safetyIssue | erroneous activation due to faulty angle of attack data ⓘ |
| softwareUpdate | Boeing 737 MAX return-to-service modifications ⓘ |
| timePeriodIntroduced | 2010s ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: MCAS Description of subject: MCAS (Maneuvering Characteristics Augmentation System) is an automated flight-control feature on the Boeing 737 MAX designed to adjust the aircraft’s nose-down pitch under certain conditions to improve handling characteristics.
Referenced by (4)
Full triples — surface form annotated when it differs from this entity's canonical label.