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All Journal Al-Muamalat : Jurnal Ekonomi Syariah Skyhawk: Jurnal Aviasi Indonesia
Ang, Soon Yong
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Humanities Decision Sciences, Operations Research & Management Economics, Econometrics & Finance Education Languange, Linguistic, Communication & Media Social Sciences Other

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Jenis Dan Peran Pentingnya Alat Pemadam Api Ringan Di Pesawat Boeing 737- 400 Dalam Keadaan Darurat Elysia, Damara Zerlina Putri; Sagoro, Michael; Auliana, Rizka Dewi Nur; Prayitno, Hadi; Ang, Soon Yong
SKYHAWK : Jurnal Aviasi Indonesia Vol. 5 No. 1 (2025): SKYHAWK: Jurnal Aviasi Indonesia
Publisher : Akademi Penerbang Indonesia Banyuwagi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52074/skyhawk.v5i1.314

Abstract

Light fire extinguishers are important for maintaining the safety of passengers and crew during flights, especially on commercial aircraft such as the Boeing 737-400.  This research aims to analyze the types and important roles of Portable Fire Extinguishers (PFE) available on the Boeing 737-400 aircraft in fire emergency situations.  This research uses a descriptive qualitative method with a case study approach on the Boeing 737-400 aircraft.  Data were obtained through literature study and field observation.  The research results show that on the Boeing 737-400 aircraft, lightweight fire extinguishers are used with dry chemicals or gases suitable for the conditions on the aircraft.  Both types of equipment are effective in extinguishing fires without endangering passengers, cabin crew, and surrounding electronic equipment.  Various types of extinguishing agents and spray systems can enhance the efficiency of lightweight fire extinguishers in the air.  This research is expected to make flights safer by protecting passengers, crew members, and aircraft from fire risks, and also for airlines to enhance routine training for cabin crew on the use of portable fire extinguishers in various fire scenarios.
Efficient Market Analysis of Jakarta Islamic Index (2019-2023) Sidik, Rahma Aulia; Suryomurti, Wiku; Ang, Soon Yong
Al-Muamalat: Jurnal Ekonomi Syariah Vol. 11 No. 2 (2024): July
Publisher : Department of Sharia Economic Law, Faculty Sharia and Law, UIN Sunan Gunung Djati Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15575/am.v11i2.35193

Abstract

This study aims to analyze the efficient market form of the Jakarta Islamic Index. The methodology used is an event study with a window period of 20 days, including ten days before and ten days after the announcement of composition changes held twice a year. The sample consists of 102, with 30 companies listed during the study period and 36 companies excluded and re-listed following the composition change announcements. The analysis technique used is the Paired Sample T-test. The findings reveal no differences in abnormal returns and trading volume activity before and after the announcement. This suggests that the market had already absorbed the announcement information before the event, resulting in a weak reaction and indicating that the announcement did not significantly impact the Jakarta Islamic Index. This implies that the index operates in a semi-strong form of market efficiency. Consequently, companies listed in the index may need additional strategies to improve their stock performance. To provide further insight, this study also examines the average stock trading activity of companies that enter and exit the composition of the Jakarta Islamic Index for the 2019-2023 periods.
Co-Authors Auliana, Rizka Dewi Nur Elysia, Damara Zerlina Putri Hadi Prayitno Sagoro, Michael Sidik, Rahma Aulia Suryomurti, Wiku