Maneuvering Characteristics Augmentation System
E561894
The Maneuvering Characteristics Augmentation System (MCAS) is an automated flight-control feature on Boeing 737 MAX aircraft designed to adjust the aircraft’s pitch based on sensor inputs, and it became widely known after its role in two fatal crashes led to the global grounding of the MAX fleet.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Maneuvering Characteristics Augmentation System canonical | 4 |
| MCAS (Maneuvering Characteristics Augmentation System) | 2 |
| MCAS flight control law | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T6018212 — 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: Maneuvering Characteristics Augmentation System Context triple: [Boeing 737 MAX 10, usesSystem, Maneuvering Characteristics Augmentation System]
-
A.
Attitude and Articulation Control Subsystem computer
The Attitude and Articulation Control Subsystem computer is the dedicated onboard system on Voyager 2 responsible for controlling the spacecraft’s orientation and the pointing of its instruments and antennas.
-
B.
Integrated Aviation Systems Program
The Integrated Aviation Systems Program is a NASA aeronautics initiative that conducts flight research and technology demonstrations to advance safer, more efficient, and transformative aviation systems.
-
C.
AFLCMC
AFLCMC is a U.S. Air Force organization responsible for the total life cycle management of Air Force weapon systems, from acquisition through sustainment and disposal.
-
D.
Rolls-Royce LiftSystem (F-35B integration)
The Rolls-Royce LiftSystem is a shaft-driven lift fan and vectoring exhaust system that enables the F-35B Lightning II to perform short takeoff and vertical landing (STOVL) operations.
-
E.
Grumman X-29
The Grumman X-29 was an experimental U.S. research aircraft notable for its forward-swept wings, advanced composite materials, and fly-by-wire control system used to explore extreme aerodynamic concepts.
- 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: Maneuvering Characteristics Augmentation System Target entity description: The Maneuvering Characteristics Augmentation System (MCAS) is an automated flight-control feature on Boeing 737 MAX aircraft designed to adjust the aircraft’s pitch based on sensor inputs, and it became widely known after its role in two fatal crashes led to the global grounding of the MAX fleet.
-
A.
Attitude and Articulation Control Subsystem computer
The Attitude and Articulation Control Subsystem computer is the dedicated onboard system on Voyager 2 responsible for controlling the spacecraft’s orientation and the pointing of its instruments and antennas.
-
B.
Integrated Aviation Systems Program
The Integrated Aviation Systems Program is a NASA aeronautics initiative that conducts flight research and technology demonstrations to advance safer, more efficient, and transformative aviation systems.
-
C.
AFLCMC
AFLCMC is a U.S. Air Force organization responsible for the total life cycle management of Air Force weapon systems, from acquisition through sustainment and disposal.
-
D.
Rolls-Royce LiftSystem (F-35B integration)
The Rolls-Royce LiftSystem is a shaft-driven lift fan and vectoring exhaust system that enables the F-35B Lightning II to perform short takeoff and vertical landing (STOVL) operations.
-
E.
Grumman X-29
The Grumman X-29 was an experimental U.S. research aircraft notable for its forward-swept wings, advanced composite materials, and fly-by-wire control system used to explore extreme aerodynamic concepts.
- F. None of above. chosen
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
flight control system
ⓘ
software-based control function ⓘ |
| abbreviation | MCAS ⓘ |
| actsOn | aircraft pitch ⓘ |
| alsoKnownAs | MCAS flight control law ⓘ |
| appliesToAircraftModel |
Boeing 737 MAX 8
ⓘ
Boeing 737 MAX 9 ⓘ |
| associatedWith |
changes in aircraft aerodynamics
ⓘ
changes in engine placement on 737 MAX ⓘ |
| canBeOverriddenBy | pilot use of stabilizer trim cutout switches ⓘ |
| consequenceOfAccidents | global grounding of Boeing 737 MAX fleet ⓘ |
| controls | horizontal stabilizer trim ⓘ |
| criticizedFor |
inadequate pilot training information
ⓘ
insufficient documentation in flight manuals ⓘ lack of redundancy in sensor inputs ⓘ |
| designedTo | reduce risk of aerodynamic stall ⓘ |
| developedBy | Boeing ⓘ |
| documentedIn | airworthiness directives for Boeing 737 MAX ⓘ |
| effect | commands nose-down stabilizer movement ⓘ |
| groundingStartYear | 2019 ⓘ |
| implementedAs | software in flight control computers ⓘ |
| industryImpact | increased scrutiny of automated flight control systems ⓘ |
| initialDesignUsed | single angle of attack sensor ⓘ |
| introducedOn |
Boeing 737 MAX development program
ⓘ
linked to:
Boeing 737 MAX
|
| involvedIn |
Ethiopian Airlines Flight 302 crash
ⓘ
linked to:
Ethiopian Airlines Flight 302
Lion Air Flight 610 crash ⓘ |
| language | English name ⓘ |
| ledTo |
changes in aircraft certification oversight practices
ⓘ
revisions to pilot training requirements for 737 MAX ⓘ |
| modifiedAfter | Boeing 737 MAX recertification process ⓘ |
| notPresentOn |
Boeing 737 Next Generation
ⓘ
linked to:
Boeing 737
|
| partOf | Boeing 737 MAX ⓘ |
| postModificationFeature |
includes angle of attack disagree logic
ⓘ
limited authority over stabilizer movement ⓘ limited number of activations per event ⓘ uses inputs from two angle of attack sensors ⓘ |
| publicPerception | controversial safety feature ⓘ |
| purpose |
augment pitch stability
ⓘ
make 737 MAX handling characteristics similar to earlier 737 models ⓘ |
| relatedTo | speed trim system ⓘ |
| safetyIssue | susceptible to erroneous angle of attack data ⓘ |
| subjectOf |
U.S. Congressional hearings
ⓘ
regulatory investigations by EASA ⓘ regulatory investigations by FAA ⓘ |
| triggerCondition |
flaps up configuration
ⓘ
high angle of attack ⓘ manual flight ⓘ |
| triggeredBy | angle of attack sensor input ⓘ |
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: Maneuvering Characteristics Augmentation System Description of subject: The Maneuvering Characteristics Augmentation System (MCAS) is an automated flight-control feature on Boeing 737 MAX aircraft designed to adjust the aircraft’s pitch based on sensor inputs, and it became widely known after its role in two fatal crashes led to the global grounding of the MAX fleet.
Referenced by (7)
Full triples — surface form annotated when it differs from this entity's canonical label.
Ethiopian Airlines Flight 302
→
causeRelatedTo
→
MCAS (Maneuvering Characteristics Augmentation System)
ⓘ
linked to: Maneuvering Characteristics Augmentation System
linked to: Maneuvering Characteristics Augmentation System
linked to: Maneuvering Characteristics Augmentation System