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.
Statements (48)
| Predicate | Object |
|---|---|
| instanceOf |
flight control system
ⓘ
software-controlled augmentation system ⓘ |
| abbreviationOf | Maneuvering Characteristics Augmentation System NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| contributedToAccident |
Ethiopian Airlines Flight 302
NERFINISHED
ⓘ
Lion Air Flight 610 NERFINISHED ⓘ |
| 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 NERFINISHED ⓘ |
| documentationIssue | limited mention in original flight crew operations manual ⓘ |
| fullName | Maneuvering Characteristics Augmentation System NERFINISHED ⓘ |
| implementation | flight control computer software ⓘ |
| inputSensor | angle of attack sensor ⓘ |
| introducedOn |
Boeing 737 MAX 8
NERFINISHED
ⓘ
Boeing 737 MAX 9 NERFINISHED ⓘ |
| 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 ⓘ |
Referenced by (2)
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