MITSUBISHI ELECTRIC CORPORATIONPUBLIC RELATIONS DIVISION
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No. 3420

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Overseas Marketing Division
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Mitsubishi Electric Corporation

Mitsubishi Electric Reports on Improper Testingof HVAC for Railcars and Air Compressor Unit for Railcars
TOKYO, June 30, 2021 – Mitsubishi Electric Corporation (TOKYO: 6503) announced today that an internal
investigation conducted by the company revealed on June 14 that inspections of certain HVAC (Heating,Ventilation and Air Conditioning systems) for railcars manufactured at its Nagasaki Works (Togitsu-Cho,Nishisonogi-Gun, Nagasaki Prefecture) were different from the inspections1 represented in specification
documents provided by customers, or that it had not actually conduct inspections or had used improperstatements in its inspection reports. Through further investigation, the company also discovered on June 28
that for certain air compressor units for railcars it had previously shipped, inspections differing from those2
represented in specification documents had been conducted or that inspections had not actually been conducted.
1 Conforming to JIS standard (announced on July 2, 2021)
2 Conforming to JRIS standard (announced on July 2, 2021)

Mitsubishi Electric halted shipments of these products as soon as the issues were discovered and currently is
only shipping products for which it has confirmed that the inspections were completed properly. It is currently
notifying railway operators and other customers of the situation. The company has confirmed that there are noissues with the safety, functionality or performance of the products already shipped. The company is not awareof any accident or other incident attributable to this matter.
Taking this matter very seriously, Mitsubishi Electric has begun investigating the reasons for these incidents
and will issue a report as soon as it has formulated measures to prevent any recurrence. The company will also
form a committee that includes external lawyers to investigate if there have been similar cases within the group.
At present, Mitsubishi Electric has not made any revisions to its consolidated earnings forecast for the current
fiscal year. The company is working in earnest with its customers to address the issue and implement
preventive measures. If any potential impacts come to light, they will be disclosed promptly.

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Discrepancies Identified (as of June 30, 2021)
Although items appearing in specification documents differ depending on each customer’s contract3, but ingeneral the following discrepancies have been identified:
1. Inspections differed from those represented in specification documents, or inspections not performed
1) Cooling-capacity tests and cooling-power-consumption tests: Pass/fail was determined based on tests
performed under different temperature and humidity conditions
2) Heating-capacity tests and power-consumption tests for systems with heating functions (heat pumpsystems): Tests were performed under different temperature and humidity conditions
3) Water resistance tests: Pass/fail was determined based on different testing method
4) Some overload tests, vibration tests, insulation-resistance tests, withstand-voltage tests, and shape anddimensional inspections were performed using in-house testing procedures differing from those in thespecifications
5) Type tests for updated model of air compressor unit for railcars: Characteristics tests of internalcompressor (unchanged from preceding model)4 were not performed and test results for the preceding
model were used.
3 Conforming to JIS E 6602/4031 standard (announced on July 2, 2021)
4 Conforming to JRIS-E-5002 standard (announced on July 2, 2021)

2. Inspection reports prepared improperly
Inspection reports submitted to some customers stated values differing from actual values:1) Values were provided in inspection reports without actually performing specified dimensional
inspections
2) Water-resistance tests differed from specified testing method and their results were entered into reports
3) Cooling-capacity tests and cooling-power-consumption tests were performed under conditions differingfrom the specified environmental conditions, and inspection reports were prepared based on results
obtained in type-tests performed earlier under specified conditions that resulted in a “pass.”###
About Mitsubishi Electric Corporation
With 100 years of experience in providing reliable, high-quality products, Mitsubishi Electric Corporation(TOKYO: 6503) is a recognized world leader in the manufacture, marketing and sales of electrical andelectronic equipment used in information processing and communications, space development and satellite
communications, consumer electronics, industrial technology, energy, transportation and building equipment.
Mitsubishi Electric enriches society with technology in the spirit of its “Changes for the Better.” The company
recorded a revenue of 4,191.4 billion yen (U.S.$ 37.8 billion*) in the fiscal year ended March 31, 2021. For
more information, please visit www.MitsubishiElectric.com*U.S. dollar amounts are translated from yen at the rate of ¥111=U.S.$1, the approximate rate on the Tokyo
Foreign Exchange Market on March 31, 2021

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