UPS Freighter Enters Active Runway at Changi During ZK-OKS Takeoff Roll
A United Parcel Service Boeing 767-300F entered an active runway in Singapore while a New Zealand aircraft was taking off, resulting in no injuries or damage.
Casualties unknown
ATR 72 accident at Karachi, PK, 27 Jun 2019 (AP-BKX)
On June 27, 2019, an ATR 72 (registration AP-BKX) operated by PIA was involved in an aviation accident near Karachi, PK. Investigators recorded the probable cause as: 3.1.1. The following findings are presented in accordance with ICAO Annex 13 requirements and reflect facts and safety-relevant conditions established during the investigation. This summary draws on records from the Safety Investigation Board of Pakistan (SIB/BASI); 8 related events involving the same aircraft type or operator are linked below.
Sourcesthe Safety Investigation Board of Pakistan (SIB/BASI)Primary reportUpdated 2026-08-30Data APIEditorial standards
Probable cause
3.1.1. The following findings are presented in accordance with ICAO Annex 13 requirements and reflect facts and safety-relevant conditions established during the investigation.
— NTSB Determination
Accident narrative
Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
BUREAU OF AIRCRAFT SAFETY INVESTIGATION PAKISTAN FINAL INVESTIGATION REPORT
SERIOUS INCIDENT ABORTED TAKE-OFF DUE TO ENGINE PROBLEM Aircraft Type
ATR 72-500 (72-212A)
Registration
AP-BKX
Operator
Pakistan International Airlines (PIA)
Flight
PK-580 Sector Karachi (OPKC) – Multan (OPMT)
Date of Occurrence
27 June 2019
Location
Karachi (OPKC)
Classification
Serious Incident
Report Status
Final Investigation Report
Report Reference
HQ BASIP/1000/423/Inv
Date of Report
03 August, 2026
This report is issued pursuant to Pakistan Aircraft Safety Investigation (PASI) Act, 2023, Air Safety Rules 2025 and ICAO Annex 13
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
TABLE OF CONTENTS SCOPE ------------------------------------------------------------------------------------------------------------III INTRODUCTION ---------------------------------------------------------------------------------------------- IV SYNOPSIS ------------------------------------------------------------------------------------------------------- V ABBREVIATIONS -------------------------------------------------------------------------------------------- VI LIST OF FIGURES ------------------------------------------------------------------------------------------VIII LIST OF TABLES --------------------------------------------------------------------------------------------- IX LIST OF APPENDICES -------------------------------------------------------------------------------------- X SECTION 1 – FACTUAL INFORMATION -------------------------------------------------------------- 1 1.1. HISTORY OF THE FLIGHT ----------------------------------------------------------------------------- 1 1.2. INJURIES TO PERSONS ------------------------------------------------------------------------------- 1 1.3. DAMAGE TO AIRCRAFT ------------------------------------------------------------------------------- 1 1.4. OTHER DAMAGE --------------------------------------------------------------------------------------- 1 1.5. PERSONNEL INFORMATION -------------------------------------------------------------------------- 1 1.6. AIRCRAFT INFORMATION ----------------------------------------------------------------------------- 2 1.7. METEOROLOGICAL INFORMATION------------------------------------------------------------------- 3 1.8. AIDS TO NAVIGATION --------------------------------------------------------------------------------- 3 1.9. COMMUNICATIONS ------------------------------------------------------------------------------------ 3 1.10. AERODROME INFORMATION ------------------------------------------------------------------------- 4 1.11. FLIGHT RECORDERS ---------------------------------------------------------------------------------- 4 1.12. WRECKAGE AND IMPACT INFORMATION ----------------------------------------------------------- 4 1.13. MEDICAL AND PATHOLOGICAL INFORMATION ----------------------------------------------------- 4 1.14. FIRE ----------------------------------------------------------------------------------------------------- 4 1.15. SURVIVAL ASPECTS ----------------------------------------------------------------------------------- 4 1.16. TESTS AND RESEARCH ------------------------------------------------------------------------------- 4 1.17. ORGANIZATIONAL AND MANAGEMENT INFORMATION ------------------------------------------- 17 1.18. ADDITIONAL INFORMATION -------------------------------------------------------------------------- 17 1.19. USE OF EFFECTIVE INVESTIGATION TECHNIQUES ---------------------------------------------- 17 SECTION 2 – ANALYSIS ----------------------------------------------------------------------------------- 19 2.1. 2.2. 2.3. 2.4. 2.5.
GENERAL ---------------------------------------------------------------------------------------------- 19 TECHNICAL ANALYSIS ------------------------------------------------------------------------------- 19 OIL FILTER POP-OUT INCIDENTS------------------------------------------------------------------- 19 INDUSTRY TRENDS AND SERVICE BULLETIN SIGNIFICANCE ----------------------------------- 20 FLIGHT CREW AND OPERATIONAL ANALYSIS ---------------------------------------------------- 20
SECTION 3 – CONCLUSIONS---------------------------------------------------------------------------- 21 3.1. 3.2.
FINDINGS ---------------------------------------------------------------------------------------------- 21 CAUSE / CONTRIBUTORY FACTORS --------------------------------------------------------------- 21
SECTION 4 – SAFETY RECOMMENDATIONS------------------------------------------------------ 23 4.1.
SAFETY RECOMMENDATIONS ---------------------------------------------------------------------- 23
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
SCOPE At Bureau of Aircraft Safety Investigation Pakistan (BASIP), investigations are conducted in accordance with Pakistan Aircraft Safety Investigation (PASI) Act, 2023, Air Safety Rules 2025, and International Civil Aviation Organization (ICAO) Annex-13. The sole objective of the investigation and its final report is to prevent future accidents, serious incidents, and incidents of similar nature, without apportioning blame or liability. Accordingly, it is inappropriate to use BASIP investigation reports to assign fault or blame or determine liability, since neither the investigation nor the reporting process has been undertaken for judiciary or administrative purposes. This report contains facts which are based on information that came to the knowledge of BASIP during the investigation up to the time of publication. Such information is published to inform the aviation industry and the public about the general circumstances of civil aviation serious incidents. Extracts may be published with specific permission from BASIP provided that the source is duly acknowledged, and the same material is reproduced accurately, and is not used in a derogatory manner or in a misleading context.
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
INTRODUCTION This serious incident was reported to Bureau of Aircraft Safety Investigation Pakistan (BASIP) by Pakistan Airports Authority (PAA) vide Incident Occurrence and Unserviceability Report (IOU). This serious incident was notified to International Civil Aviation Organization (ICAO), Transportation Safety Board (TSB) Canada, Bureau of Enquiry and Analysis (BEA) for Civil Aviation Safety, France in line with Annex-13. The investigation has been conducted by BASIP. All corresponding timings are mentioned in Universal Coordinated Time (UTC). .
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
SYNOPSIS On 27 June 2019, ATR 72-500 aircraft AP-BKX, operated by Pakistan International Airlines (PIAC) as flight PK-580 from Jinnah International Airport (JIAP), Karachi to Multan International Airport (OPMT), Multan, experienced a No. 2 engine malfunction during the take-off roll at JIAP, Karachi. While the aircraft was accelerating for take-off, a loud bang was heard, and the No. 2 engine torque decreased from approximately 90% to 40%. The flight crew rejected the take-off, shut down the affected engine, and safely taxied the aircraft back to the parking stand. There were no injuries to the 38 persons on board and no damage to third-party property. Metallurgical examination determined that the second-stage Power Turbine (PT2) blade fractures originated from leading-edge cracks caused by Type I sulphidation hot corrosion. The cracks propagated by fatigue and resulted in overload fracture of the blades, causing engine malfunction and secondary internal damage. The investigation found that the failure mechanism was consistent with a known in-service PT2 blade degradation trend within the PW127 engine fleet. Although the occurrence engine incorporated SB 21876, subsequent service experience resulted in the issuance of SB 21917 and SIL PW100-188 to address continued PT2 blade distress. The investigation concluded that the rejected take-off resulted from PT2 blade fracture caused by sulphidation-induced fatigue cracking. No safety recommendations were issued as corrective actions had already been implemented by the manufacturer.
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
ABBREVIATIONS ATC
Air Traffic Control
ATCOs
Air Traffic Controller
ATPL
Air Transport Pilot License
BASIP
Bureau of Aircraft Safety Investigation Pakistan
BEA
Bureau of Enquiry and Analysis
CPL
Commercial Pilot License
CVR
Cockpit Voice Recorder
DFDR
Digital Flight Data Recorder
EDS
Energy Dispersive Spectrum
EMM
Engine Maintenance Manual
FO
First Officer
FOD
Foreign Object Debris
Ft
Feet
HF
High Frequency
ICAO
International Civil Aviation Organization
ILS
Instrument Landing System
IOU
Incident Occurrence and Unserviceability Report
JIAP
Jinnah International Airport
KGs
Kilograms
Km
Kilometers
kt
Knot
LE
Leading Edge
MCD
Magnetic Chip Detector
OPKC
Karachi
OPMT
Multan
P&WC
Pratt & Whitney, Canada
PAA
Pakistan Airports Authority
PASI
Pakistan Air Safety Investigation
PCAA
Pakistan Civil Aviation Authority
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
PIAC
Pakistan International Airlines
PT
Power Turbine
R/W
Runway
RFFS
Rescue & Fire Fighting Services
RGB
Reduction Gearbox
RTO
Rejected Take Off
SB
Service Bulletin
SEM
Scanning Electron Microscope
SOPs
Standard Operating Procedures
TE
Trailing Edge
T/W
Taxiway
TM
Turbo Machinery
TSB
Transportation Safety Board
UTC
Universal Coordinated Time
VHF
Very High Frequency
VMC
Visual Meteorological Conditions
BASIP | FINAL INVESTIGATION REPORT | PK-580 / AP-BKX | 27 June, 2019
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Final Investigation Report M/s PIAC PK-580 ATR 72-500 aircraft AP-BKX, 27 Jun 2019
LIST OF FIGURES Figure 1 Fracture 2nd Stage PT Blades at different height .................................................. 5 Figure 2 TM MCD and RGB MCD ...................................................................................... 6 Figure 3 TM Main Oil Filter ................................................................................................. 6 Figure 4 2nd Stage PT Disc Assembly and Impact Disc ...................................................... 7 Figure 5 2nd Stage PT Stator and Inner Ring ...................................................................... 7 Figure 6 1st Stage PT Blades .............................................................................................. 8 Figure 7 No. 6 & 7 Bearing Outer Race .............................................................................. 8 Figure 8 No 6 and 7 Bearing Outer Race............................................................................ 9 Figure 9 No 7 Bearing Rollers............................................................................................. 9 Figure 10 PT Shaft .............................................................................................................10 Figure 11 PT Shaft .............................................................................................................10 Figure 12 No1 and No 2 Bearing .......................................................................................10 Figu
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