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Plane
Plane 1:  <a href="iridium74and21.htm">21</a>   72   75   70   62   14   64   65   66   67   68   <a
href="iridium74and21.htm">74</a> 					(note: Iridium 74 is probably a partial failure)
Plane 2:  22   <a href="iridium94.htm">94</a>   76   25   23   46   47   20   49   <a
href="iridium11and26.htm">11</a>    3          				(note: Iridium 23 is probably a partial failure)
Plane 3:  55   <a href="iridium28and95.htm">95</a>   45   <a
href="iridium30and31.htm">31</a>   <a href="iridium30and31.htm">30</a>   32   <a
href="iridium33collision.htm">91</a>   <em>  </em>   58   59   60   					
Plane 4:  19   34   35   <a href="iridium36and97.htm">97</a>    <a
href="iridium5and51.htm">5</a>  6/51   <a
href="iridium7and51.htm">7</a>    8   96   37   61   					(note: Iridiums 6, 7 and 51 are probably partial failures)
Plane 5:  50   56   52   53   <a href="iridium9and84.htm">84</a>   10   54   12   13   83   <a
href="iridium16and86.htm">86</a>   <a href="iridium91.htm">90 (launched to plane 3, but has been migrated to plane 5)</a>
Plane 6:  18   98   40   15   80   <a href="iridium17and77.htm">77</a>        81   <a
href="iridium38and82.htm">82</a>   41   43  <strong> 
</strong></pre>

<pre>Original &lt;----- Failed -----&gt;       	   &lt;- Failed -&gt;    <em>Note that some of the failed</em> <em>satellites have drifted from the original orbital planes</em>
Orbital  (but still in orbit)       	    (decayed)
Plane                                	          <em>     </em>
Plane 1:  73t  63
Plane 2:  69t  24t  71t  <a href="iridium11and26.htm">26</a>           	 	48d
Plane 3:  <a href="iridium28and95.htm">28</a>   29<font
color="#FF0000">   </font><a href="iridium33collision.htm"><font
color="#FF0000">33</font></a>t  57           		27d           <em>Iridium 33 was fragmented by the collison with Cosmos 2251 on February 10, 2009</em>
Plane 4:   4   <a href="iridium36and97.htm">36</a>t
Plane 5:   2t 914t 911t  <a href="iridium16and86.htm">16</a>t          		85d   <a
href="iridium9and84.htm">9</a>d      <em>Iridium 2 has drifted far from</em> <em>its original launch plane, and continues to drift</em>
Plane 6: 920t 921t  44t  <a href="iridium38and82.htm">38</a>t  <a
href="iridium17and77.htm">17</a>t 42t 39	79d           </pre>

<p>t indicates satellites that have been reported as tumbling out
of control. </p>

<p>In their quarterly report dated 30 June, 2016, Iridium
Satellite LLC acknowledged the failure of two satellites in the
preceding quarter year.</p>

<p>In June 2016, Iridium 15 (24869, 1997-034A) was moved from
Plane 6, Slot 7 to Plane 6, Slot 4, replacing Iridium 39 (25042,
1997-069D). The intention may have been to swap over the two
satellites but, in any case problems were experienced with with
Iridium 39, which was then removed from the operational
constellation, leaving a gap at Plane 6, Slot 7. No spare was
available to replace it.</p>

<p>In May 2016, Iridium 57 (25273, 1998-019B) began to drift away
slowly from its nominal position (Plane 3, Slot 8) and has
presumably failed. See<a
href="http://www.satobs.org/seesat/May-2016/0069.html"> Iridium
57 looks to have a bad attitude</a>.</p>

<p>In the middle of 2015, Iridium 45 (25104, 1997-082A) which had
been migrating from orbital plane 2 towards orbital plane 3 for
about 14 months, arrived in oribital plane 3. It appears to have
already been in operational use as part of orbital plane 3 for
some months previously, even though it was not in its final
orbital location (Plane 3, Slot 3).</p>

<p>In early December 2014, Space-Track catalogued four items of
debris (40324-40327, 2002-05G to 2002-05K) associated wth the
2002-05 launch .These are labelled by Space-Track as
&quot;IRIDIUM 91 DEB&quot;, and seem to be associated with
Iridium 91 (27372, 2002-005A) which appears, however, to remain
fully operational.</p>

<p>In early October 2014, <a href="iridium7and51.htm">Iridium 51
(25262, 1998-018A)</a>, which had been paired wth <a
href="iridium7and51.htm">Iridium 7 (24793, 1997-020B)</a> was
moved within orbital plane 4 to be paired with Iridium 6 (24794.
1997-020C).</p>

<p>At the end of August 2014, Iridium 14 (25777, 1999-032A) ,
whch had been spare in orbital plane 1 since launch, was raised
to operational altitude to replace Iridium 63 (25286. 1998-021B),
which had presumably failed.</p>

<p>At the end of August 2014, Iridium 98 (27451, 2002-301B) ,
whch had been spare in orbital plane 6 since migrating from plane
4, was raised to operational altitude a few seconds behind
Iridium 42 (25077. 1977-077) which had presumably failed. Iridium
42 has since been reported to be flashing.</p>

<p>By early 2014, Iridium 45 (25104, 1997-082A) was no longer
maintaining its place in orbital plane 2, and was evidently
migrating towards orbital plane 3. Its place in orbital plane 2,
slot 5 was taken by Iridium 23 (24906, 1997-043D).</p>

<p>By early 2014, Iridium 29 (24944, 1997-051A) had ceased to
maintain its position in the constellation, and had presumably
failed. At that time, there was no spare available in plane 3 to
replace it..</p>

<p>On 20 November, 2012, Iridium 96 (27376, 2002-005E),
previously spare in orbital place 3, began migrating towards
orbital plane 4, which had no on-orbit spare, This left orbital
place 3 without a spare. The migration took around twelve months.
Iridium 96 took over from failed Iridium 4 (24796, 1997-020E).
Iridium 96 was raised to operational altitude several months
before its arrival in plane 4 and appears to have been brought
into use at that time.</p>

<p>On 13 November, 2012, Iridium 94 (27374, 2002-005C), which had
been migrating over the past year from orbital place 3, arrived
at orbital plane 2, and was immediately raised to operational
altitude to replace Iridium 23 (24906, 1997-043D) which had
evidently failed, though retaining at least some functionality.
Iridium 23 initially remained at operational altitude a few
seconds behind Iridium 94, but was later used to replace Iridium
45 (25104, 1997-02A).</p>

<p>In mid 2012, Iridium 4 (24796, 1997-020E) ceased to maintain
its position in the constellation. At that time, Plane 4 had no
on-orbit spare</p>

<p>In late July 2012,<a href="iridium7and51.htm"> Iridium 51
(25262, 1998-018A). which had been out of the operational
constellation for many years, was moved in the position
previously occupied by Iridium 7 (24793, 1997-020B)</a>, while
Iridum 7 was moved to follow slightly behind it. The two
satellites were each providing some of the functionality for the