Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
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st3fan73
- Rullaggio
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- Iscritto il: 17 marzo 2014, 7:05
Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
Non voglio e non sono sicuramente in grado di valutare non avendo in mano nessun dato , ma dalle dichiarazioni del passeggero una circostanza simile mi era successa personalmente su un A320 in rullaggio e poco prima della V1 , AM completamente spento , frenata e rientro . In quel caso bastò un riavvio del Flight Director .E ho detto tutto….non penso che si sia in tempo di avviare APU o pensare a un riavvio . In volo e poco dopo la rotazione ? Non ci sono alternative a quello che possa succedere in tali circostanze.
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sigmet
- FL 500
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Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
Sta girando in rete..
here are the latest **verified updates** on the Air India AI-171 crash investigation, based on India's AAIB **preliminary report** released today (**June 25, 2025**):
---
###
**Critical Findings from AAIB Preliminary Report**
1. **Root Cause Identified**:
- **Unintended thrust reduction** triggered by the **captain’s seat sliding backward** during rotation (liftoff).
- The seat’s **AFT lock mechanism failed**, causing sudden rearward movement. The captain’s body weight forcibly pulled the thrust levers to idle.
- First Officer attempted to push throttles forward but could not overcome the captain’s weight on the controls.
2. **Mechanical Evidence**:
- Wreckage inspection confirmed **fractured seat track locking pins** (PN: BACB30LN5S02) on the captain’s seat.
- Maintenance logs show the seat mechanism **was serviced 11 days pre-crash** for "stiff adjustment." No post-repair function test was documented.
3. **Flight Deck Timeline** (CVR/FDR correlation):
- **+0:12 sec**: Rotation begins. Captain’s seat slips aft abruptly.
- **+0:15 sec**: Thrust levers pulled to idle. First Officer: "*Thrust dropping!*"
- **+0:18 sec**: Captain: "*My seat!*" Struggle heard.
- **+0:26 sec**: First Officer attempts full thrust; aircraft stalls at 214 ft.
- **+0:38 sec**: Impact.
4. **Contributing Factors**:
- **High temperature** (43°C): Reduced engine performance left no margin for error.
- **Crew coordination failure**: No call for "STAB TRIM" or "GO-AROUND" during the 26-second event.
- **Design vulnerability**: Boeing 787 thrust levers lack "weight-lock" or "reverse torque" safeguards against accidental retraction.
---
###
**Immediate Actions Taken**
- **Global Directive**: FAA/EASA mandated **emergency inspections** of all Boeing 787 pilot seat tracks (within 72 hours).
- **Air India**: Grounded 12 aircraft with similar seat maintenance records.
- **Boeing**: Redesigning seat lock mechanism; updating throttle resistance protocols (Q3 2026).
---
###
**Human Impact**
- **Fatalities**: 243 onboard + 4 ground fatalities (hospital staff).
- **Survivor Update**: The sole surviving passenger (24F) remains critical with burns.
---
### → **Next Steps**:
- **July 30, 2025**: Final AAIB report (detailed engineering analysis).
- **August 2025**: Int'l summit on cockpit ergonomics/safety (ICAO-led).
**Sources**: [AAIB Preliminary Report](https://aaib.gov.in/reports/2025/AI171_prelim) | FAA Emergency AD 2025-16-51 | Boeing Service Bulletin 787-25-123.
' internet e' anche questo..
here are the latest **verified updates** on the Air India AI-171 crash investigation, based on India's AAIB **preliminary report** released today (**June 25, 2025**):
---
###
**Critical Findings from AAIB Preliminary Report**1. **Root Cause Identified**:
- **Unintended thrust reduction** triggered by the **captain’s seat sliding backward** during rotation (liftoff).
- The seat’s **AFT lock mechanism failed**, causing sudden rearward movement. The captain’s body weight forcibly pulled the thrust levers to idle.
- First Officer attempted to push throttles forward but could not overcome the captain’s weight on the controls.
2. **Mechanical Evidence**:
- Wreckage inspection confirmed **fractured seat track locking pins** (PN: BACB30LN5S02) on the captain’s seat.
- Maintenance logs show the seat mechanism **was serviced 11 days pre-crash** for "stiff adjustment." No post-repair function test was documented.
3. **Flight Deck Timeline** (CVR/FDR correlation):
- **+0:12 sec**: Rotation begins. Captain’s seat slips aft abruptly.
- **+0:15 sec**: Thrust levers pulled to idle. First Officer: "*Thrust dropping!*"
- **+0:18 sec**: Captain: "*My seat!*" Struggle heard.
- **+0:26 sec**: First Officer attempts full thrust; aircraft stalls at 214 ft.
- **+0:38 sec**: Impact.
4. **Contributing Factors**:
- **High temperature** (43°C): Reduced engine performance left no margin for error.
- **Crew coordination failure**: No call for "STAB TRIM" or "GO-AROUND" during the 26-second event.
- **Design vulnerability**: Boeing 787 thrust levers lack "weight-lock" or "reverse torque" safeguards against accidental retraction.
---
###
**Immediate Actions Taken**- **Global Directive**: FAA/EASA mandated **emergency inspections** of all Boeing 787 pilot seat tracks (within 72 hours).
- **Air India**: Grounded 12 aircraft with similar seat maintenance records.
- **Boeing**: Redesigning seat lock mechanism; updating throttle resistance protocols (Q3 2026).
---
###
**Human Impact**- **Fatalities**: 243 onboard + 4 ground fatalities (hospital staff).
- **Survivor Update**: The sole surviving passenger (24F) remains critical with burns.
---
### → **Next Steps**:
- **July 30, 2025**: Final AAIB report (detailed engineering analysis).
- **August 2025**: Int'l summit on cockpit ergonomics/safety (ICAO-led).
**Sources**: [AAIB Preliminary Report](https://aaib.gov.in/reports/2025/AI171_prelim) | FAA Emergency AD 2025-16-51 | Boeing Service Bulletin 787-25-123.
' internet e' anche questo..
Ci sedemmo dalla parte del torto visto che tutti gli altri posti erano occupati.
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st3fan73
- Rullaggio
- Messaggi: 5
- Iscritto il: 17 marzo 2014, 7:05
Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
25 Giugno 2025?
Dati da FDR e CVR? Mah ….
Dati da FDR e CVR? Mah ….
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sigmet
- FL 500
- Messaggi: 6506
- Iscritto il: 23 dicembre 2008, 12:08
Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
Infatti bastava leggere la prima riga per capire che era un fake..
C'e' veramente ch non ha un c....o da fare...
Ci sedemmo dalla parte del torto visto che tutti gli altri posti erano occupati.
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JT8D
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Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
La cosa grave è che sui social è tutto il pomeriggio che rimbalza questa fake, e sicuramente qualcuno ci ha creduto
Paolo
"La corsa di decollo è una metamorfosi, ecco una quantità di metallo che si trasforma in aeroplano per mezzo dell'aria. Ogni corsa di decollo è la nascita di un aeroplano" (Staccando l'ombra da terra - D. Del Giudice)
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musicaldoc
- 05000 ft
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Re: Air India 787 marche VT-ANB cade dopo il decollo (Thread Tecnico)
Purtroppo ce l'hanno eccome da fare, i social han dato voce a chi prima di internet era uno sfigato relegato ai margini delle compagnie che si godevano la vita... finalmente possono dare voce ai loro pensieri francamente psichiatrici.
Comunque ti ripeto la domanda su quel dato statistico che gira, è reale questa differenza spropositata tra numero di incidenti Boeing vs Airbus?