Read More: Questioning Single-Engine Helicopter Performance
February 26, 2019

Let’s focus on what causes most accidents (hint: it’s not engine failures).

While the US helicopter industry enjoys relatively nonrestrictive single­engine regulations, the rest of the world is experiencing increasingly prescriptive standards and recommended practices issued by the International Civil Aviation Organization (ICAO) that are aimed directly at limiting the operation of single-engine helicopters.

ICAO’s reasoning: if an engine failure occurs at any time during the flight, a single-engine aircraft will be forced to land. Governments that participate in ICAO are offered two choices. Either (1) restrict the operation of single-engine aircraft over congested areas (ICAO defines these as any used for residential, commercial, or recreational purposes, which ends up eliminating a lot of land, particularly in densely populated countries) or (2) implement their own performance standards for helicopter operations (which the United States, among others, has done). The result is that single-engine aircraft are being regulated out of the civil fleet in many of the 192 nations that are ICAO members.

In fact, there is no justifiable reason to portray single-­engine helicopters as being inherently more dangerous. Companies that work regularly in mountainous and high-terrain areas often use single-engine helicopters because of their superior performance under those conditions. And just like single-engine helicopters, those with twin engines have only one tail rotor, one main rotor gear box, one tail rotor gearbox, and one tail rotor drive shaft. The failure of any one of these critical components means that aircraft is going down—regardless of the number of engines.

The sad truth is that the majority of helicopter mishaps result from pilots making judgment errors, losing control of the aircraft, and flying perfectly good machines into terrain. According to the US Helicopter Safety Team, the top three types of helicopter mishaps (loss of control, unintended flight in instrument meteorological conditions, and low-altitude operations) accounted for more than 50 percent of the helicopter fatalities (104), more than the remaining 15 types combined (96).

Accident data from other ICAO-participating states support the safety of single-engine helicopters. The Australian Transportation Safety Board classified accidents over a five-year period as either mechanical or operational. Of the 749 accidents recorded during the period, just over a quarter (197) were attributed to mechanical problems. In other words, close to 75 percent of those accidents were not mechanical (that is, pilot error).

Japan, a country with a relatively small land mass and numerous mountains, is an ICAO-participating state that employs over 300 single-engine helicopters. According to Japanese aviation records, there are presently 814 registered helicopters operating in the country, with a ratio of 42.1 percent single-engine and 57.9 percent twin. Over the last 20 years, the numbers of single­engine helicopters have decreased, but the country still has many single-engine helicopters that regularly fly over Japanese airspace.

According to statistics obtained from its Transport Safety Board, Japan has not experienced a single accident or incident caused by an engine failure in the last 10 years. Once again, pilot error is the leading cause of accidents or incidents—in singles and twins. Although mechanical issues did contribute to mishaps, they were caused by detachment of the tail rotor (immune from the number of engines) and a fire in the cargo compartment.

These mishap statistics tell the same story as those from the United States: the clear majority of helicopter accidents are caused by pilot error, not by system malfunction. Wouldn’t our attention, time, and money be better spent on training pilots instead of banning single­-engine helicopters?

Instead of focusing an inordinate amount of time, energy, and resources to paint single-engine helicopters as potential high-risk operations, ICAO and its member states should instead invest in improved pilot training, risk assessment and mitigation, and crew resource ­management.

Read More: The Power of Procedure
November 13, 2018

Procedures exist so that you avoid repeating the accidents of others.

The high rate of helicopter flight–related mishaps in recent years is alarming. Yet, despite endless preaching and PowerPoint presentations, pilots continue to power perfectly good helicopters into the dirt.

Instead of telling you about why it’s important to fly safe, I’m going to ask you to focus on how to be safe. Here’s the secret: stop letting external factors influence your actions, properly weigh the risks before starting the engine(s), and most importantly—follow procedures!

It seems pilots and maintainers often fail to follow procedures, sometimes intentionally. This is referred to as procedural (intentional) noncompliance, or PiNC.

You can begin to see the severity of the problem when you consider the Boeing Commercial Airplane Group’s analysis of commercial jet airplane hull loss statistics from 1982–91.(1) “Boeing claimed that flying pilot adherence to procedures could have prevented 50 percent of the 232 fatal hull losses in that ten-year period.” Boeing further concluded that this figure would have been higher if the nonflying pilot’s failure to comply with procedures was included.

Procedures for checking aviation weather and filing flight plans are clearly delineated in FAA regulations. Yet, according to 2016 research, weather was a cause or contributing factor in 35 percent of fatal GA accidents, of which 60 percent occurred while instrument meteorological conditions were present.(2) How many of these mishaps could have been avoided if pilots had simply followed procedures?

In 2006, Australia’s Civil Aviation Safety Authority (CASA) went so far as to write letters to all Australian pilots about their lack of adherence to mandatory procedures. The Australian regulator stated that flight crews “may also attempt non-standard procedures because they mistakenly believe they are safer than the approved, and legally mandatory, procedures.”(3) Ignoring procedures so that you can be safer runs counter to the common maxim that aviation regulations are written in blood—the regulations and the procedures they mandate exist precisely to prevent or avoid unsafe conditions.

This ROTOR features the debut appearance of a regular department: Recent Accidents & Incidents. In this issue, we list 43 rotary-wing accidents and incidents that have occurred between July 1, 2018, and September 30, 2018. Forty-three—in only three months! And that list draws mostly from the United States (although we will add coverage of other countries in the future).

In future columns, I and other writers will discuss additional ways to fly safe. But in the meantime, do yourself (and those you fly with) a favor: follow procedures!  

Endnotes:

1. Graeber and Moodi, “Understanding flight crew adherence to procedures: The procedural event analysis too (PEAT);” 1998.

2. Andrew J. Fultz & Walker S. Ashley. Physical Geography, 2016. “Fatal weather-related general aviation accidents in the United States.” http://dx.doi.org/10.1080/02723646.2016.1211854.

3. CASA warns pilots: It’s deadly to ignore procedures; 26 June 2006; CASA.