# NTSB DCA22LA038: Boeing 747-4B5F, N705CK, Miami, FL, November 29, 2021

- Type: NTSB accident investigation
- Classification: Accident · No injuries · Class 4 · Limited · Final report
- Date: November 29, 2021, 11:57 local (16:57 UTC)
- Place: Miami, FL
- Coordinates: 25.47, -80.17
- Nearby events: https://openairdocs.org/map.md?lat=25.4700&lon=-80.1700&mi=10
- Phase of flight: [Landing](https://openairdocs.org/ntsb-phases/550) (OpenAirDocs' grouping)
- Defining event: [Landing: Aircraft structural failure](https://openairdocs.org/ntsb-events/337)
- Highest injury: No injuries
- Injuries: 2 uninjured
- Status: Completed
- Report: Approved by Office Director
- Investigation class: Class 4 - Basic report with no Prelim publish
- NTSB office: Major Investigations Division
- Parties: FAA, Boeing
- NTSB case key (mKey): 104355
- NTSB case page: https://web.ntsb.gov/investigations/?ntsbnumber=DCA22LA038
- NTSB report (PDF, downloads): https://data.ntsb.gov/carol-repgen/api/Aviation/ReportMain/GenerateNewestReport/104355/pdf
- Page: https://openairdocs.org/ntsb/DCA22LA038

## Probable cause

Incorrect lubrication of the foreflap fitting assembly.

## Findings

NTSB's coded findings; those marked are part of the probable cause.

- [Wing structure: leading edge devices](https://openairdocs.org/ntsb-findings/01035754): Aircraft › Aircraft structures · Incorrect service/maintenance (probable cause); cases with it: [Boeing 747-4B5F, 1 case](https://openairdocs.org/ntsb-findings/01035754/cases.md?model=13848BH), [All aircraft, 3 cases](https://openairdocs.org/ntsb-findings/01035754/cases.md)

## Sequence of events

The events NTSB coded, in order, by phase of flight. The defining event best describes what happened.

- [Landing: Aircraft structural failure](https://openairdocs.org/ntsb-events/337) (defining event); cases with it: [Boeing 747-4B5F, 1 case](https://openairdocs.org/ntsb-events/337/sequence.md?model=13848BH), [All aircraft, 290 cases](https://openairdocs.org/ntsb-events/337/sequence.md)

## Analysis

The flight crew reported that upon arrival at KMIA, another flight reported seeing something fly off their airplane. Post-flight inspection revealed damage to the right-hand inboard flaps, fuselage and right horizontal stabilizer. Upon lowering flaps, a section of the trailing edge flap was also missing. Examination of the damaged components revealed that the right inboard foreflap fitting assembly had not been lubricated in accordance with a manufacturer’s service bulletin.

## Aircraft

- Registration: [N705CK](https://openairdocs.org/aircraft/N705CK), registered now, S/N 26413, built 2001 (OpenAirDocs)
- Reported make and model: BOEING 747-4B5F
- Registry model: [Boeing 747-4B5F](https://openairdocs.org/model/boeing-747-4b5f) (registry code 13848BH) (OpenAirDocs)
- Registry engine: [Pratt & Whitney PW4056](https://openairdocs.org/engine/pratt-whitney-pw4056) (registry code 51665, turbo-fan) (OpenAirDocs)
- Category: Airplane
- Serial number: 26413
- Year built: 2001
- Engines: P & W PW4056 56750 lbs thrust turbo fan; P & W PW4056 56750 lbs thrust turbo fan; P & W PW4056 56750 lbs thrust turbo fan; P & W PW4056 56750 lbs thrust turbo fan
- Damage: Substantial damage
- Flight: Part 121
- Operator: Kalitta Air LLC
- Registered owner: Kalitta Air LLC
- Airworthiness certificate: Standard, Transport
- Departed: SCEL, Santiago, OF
- Destination: Same as departure
- Flight plan: IFR
- Airport: KMIA, Miami

## Flight crew

As NTSB recorded them. NTSB leaves out names.

- Pilot; age 47; airline transport; airplane ratings: multi-engine land; instrument ratings: airplane; medical: class 1; seat: left; flight hours: 3,039 total, 3,039 in this make and model
- Co-pilot; seat: right; flight hours: 1,805 total, 1,805 in this make and model

## Weather

- Conditions: Visual (VMC), Day
- Observed at: KMIA

From the NTSB's public API. Aircraft are matched to registry aircraft by N-number and event date, checked against the reported serial number, make and model; the registry's history has gaps, so older matches can be wrong. Compare the reported make and model.

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